11 x1 t10 04 concavity (2012)
TRANSCRIPT
Concavity
Concavity The second deriviative measures the change in slope with respect to x,
this is known as concavity
Concavity
up concave is curve the,0 If xf
The second deriviative measures the change in slope with respect to x,
this is known as concavity
Concavity
up concave is curve the,0 If xf
down concave is curve the,0 If xf
The second deriviative measures the change in slope with respect to x,
this is known as concavity
Concavity
up concave is curve the,0 If xf
down concave is curve the,0 If xf
inflection ofpoint possible ,0 If xf
The second deriviative measures the change in slope with respect to x,
this is known as concavity
Concavity
up concave is curve the,0 If xf
235sketch derivative second at the lookingBy e.g. 23 xxxy
down concave is curve the,0 If xf
inflection ofpoint possible ,0 If xf
The second deriviative measures the change in slope with respect to x,
this is known as concavity
Concavity
up concave is curve the,0 If xf
235sketch derivative second at the lookingBy e.g. 23 xxxy
down concave is curve the,0 If xf
inflection ofpoint possible ,0 If xf
3103 2 xxdx
dy
The second deriviative measures the change in slope with respect to x,
this is known as concavity
Concavity
up concave is curve the,0 If xf
235sketch derivative second at the lookingBy e.g. 23 xxxy
down concave is curve the,0 If xf
inflection ofpoint possible ,0 If xf
3103 2 xxdx
dy
The second deriviative measures the change in slope with respect to x,
this is known as concavity
1062
2
xdx
yd
Concavity
up concave is curve the,0 If xf
235sketch derivative second at the lookingBy e.g. 23 xxxy
down concave is curve the,0 If xf
inflection ofpoint possible ,0 If xf
3103 2 xxdx
dy
The second deriviative measures the change in slope with respect to x,
this is known as concavity
1062
2
xdx
yd
0 whenup concave is Curve2
2
dx
yd
Concavity
up concave is curve the,0 If xf
235sketch derivative second at the lookingBy e.g. 23 xxxy
down concave is curve the,0 If xf
inflection ofpoint possible ,0 If xf
3103 2 xxdx
dy
The second deriviative measures the change in slope with respect to x,
this is known as concavity
1062
2
xdx
yd
0 whenup concave is Curve2
2
dx
yd
3
5
0106 i.e.
x
x
Concavity
up concave is curve the,0 If xf
235sketch derivative second at the lookingBy e.g. 23 xxxy
down concave is curve the,0 If xf
inflection ofpoint possible ,0 If xf
3103 2 xxdx
dy
The second deriviative measures the change in slope with respect to x,
this is known as concavity
1062
2
xdx
yd
0 whenup concave is Curve2
2
dx
yd
3
5
0106 i.e.
x
x
y
x
3
5
Concavity
up concave is curve the,0 If xf
235sketch derivative second at the lookingBy e.g. 23 xxxy
down concave is curve the,0 If xf
inflection ofpoint possible ,0 If xf
3103 2 xxdx
dy
The second deriviative measures the change in slope with respect to x,
this is known as concavity
1062
2
xdx
yd
0 whenup concave is Curve2
2
dx
yd
3
5
0106 i.e.
x
x
y
x
3
5
Turning Points
Turning Points All turning points are stationary points.
Turning Points All turning points are stationary points.
point turningminimum ,0 If xf
Turning Points All turning points are stationary points.
point turningminimum ,0 If xf
point turningmaximum ,0 If xf
Turning Points All turning points are stationary points.
point turningminimum ,0 If xf
point turningmaximum ,0 If xf
1 of points turning theFind e.g. 23 xxxy
Turning Points All turning points are stationary points.
point turningminimum ,0 If xf
point turningmaximum ,0 If xf
1 of points turning theFind e.g. 23 xxxy
123 2 xxdx
dy
Turning Points All turning points are stationary points.
point turningminimum ,0 If xf
point turningmaximum ,0 If xf
1 of points turning theFind e.g. 23 xxxy
123 2 xxdx
dy
262
2
xdx
yd
Turning Points All turning points are stationary points.
point turningminimum ,0 If xf
point turningmaximum ,0 If xf
1 of points turning theFind e.g. 23 xxxy
123 2 xxdx
dy
262
2
xdx
yd
0 occur when points Stationary dx
dy
Turning Points All turning points are stationary points.
point turningminimum ,0 If xf
point turningmaximum ,0 If xf
1 of points turning theFind e.g. 23 xxxy
123 2 xxdx
dy
262
2
xdx
yd
0 occur when points Stationary dx
dy
0123 i.e. 2 xx
Turning Points All turning points are stationary points.
point turningminimum ,0 If xf
point turningmaximum ,0 If xf
1 of points turning theFind e.g. 23 xxxy
123 2 xxdx
dy
262
2
xdx
yd
0 occur when points Stationary dx
dy
0123 i.e. 2 xx
0113 xx
Turning Points All turning points are stationary points.
point turningminimum ,0 If xf
point turningmaximum ,0 If xf
1 of points turning theFind e.g. 23 xxxy
123 2 xxdx
dy
262
2
xdx
yd
0 occur when points Stationary dx
dy
0123 i.e. 2 xx
0113 xx
1or 3
1 xx
04
216,1when 2
2
dx
ydx
04
216,1when 2
2
dx
ydx
point turningmaximum a is 1,2-
04
216,1when 2
2
dx
ydx
point turningmaximum a is 1,2-
04
23
16,
3
1when
2
2
dx
ydx
04
216,1when 2
2
dx
ydx
point turningmaximum a is 1,2-
04
23
16,
3
1when
2
2
dx
ydx
point turningminimum a is 27
22,
3
1
Inflection Points
Inflection Points A point of inflection is where there is a change in concavity, to see if
there is a change, check either side of the point.
Inflection Points A point of inflection is where there is a change in concavity, to see if
there is a change, check either side of the point.
264 of point(s) inflection theFind e.g. 23 xxy
Inflection Points A point of inflection is where there is a change in concavity, to see if
there is a change, check either side of the point.
264 of point(s) inflection theFind e.g. 23 xxy
xxdx
dy1212 2 1224
2
2
xdx
yd
Inflection Points A point of inflection is where there is a change in concavity, to see if
there is a change, check either side of the point.
264 of point(s) inflection theFind e.g. 23 xxy
xxdx
dy1212 2 1224
2
2
xdx
yd
0 occur when inflection of points Possible2
2
dx
yd
Inflection Points A point of inflection is where there is a change in concavity, to see if
there is a change, check either side of the point.
264 of point(s) inflection theFind e.g. 23 xxy
xxdx
dy1212 2 1224
2
2
xdx
yd
0 occur when inflection of points Possible2
2
dx
yd
01224 .. xei
2
1x
Inflection Points A point of inflection is where there is a change in concavity, to see if
there is a change, check either side of the point.
264 of point(s) inflection theFind e.g. 23 xxy
xxdx
dy1212 2 1224
2
2
xdx
yd
0 occur when inflection of points Possible2
2
dx
yd
01224 .. xei
2
1x
x
2
2
dx
yd0
2
1
2
1
2
1
Inflection Points A point of inflection is where there is a change in concavity, to see if
there is a change, check either side of the point.
264 of point(s) inflection theFind e.g. 23 xxy
xxdx
dy1212 2 1224
2
2
xdx
yd
0 occur when inflection of points Possible2
2
dx
yd
01224 .. xei
2
1x
x
2
2
dx
yd0
2
1
2
1
(0)
(12)
2
1
Inflection Points A point of inflection is where there is a change in concavity, to see if
there is a change, check either side of the point.
264 of point(s) inflection theFind e.g. 23 xxy
xxdx
dy1212 2 1224
2
2
xdx
yd
0 occur when inflection of points Possible2
2
dx
yd
01224 .. xei
2
1x
x
2
2
dx
yd0
2
1
2
1
(-1) (0)
(-12) (12)
2
1
Inflection Points A point of inflection is where there is a change in concavity, to see if
there is a change, check either side of the point.
264 of point(s) inflection theFind e.g. 23 xxy
xxdx
dy1212 2 1224
2
2
xdx
yd
0 occur when inflection of points Possible2
2
dx
yd
01224 .. xei
2
1x
x
2
2
dx
yd0
2
1
2
1
(-1) (0)
(-12) (12)
concavityin change a is there
2
1
Inflection Points A point of inflection is where there is a change in concavity, to see if
there is a change, check either side of the point.
264 of point(s) inflection theFind e.g. 23 xxy
xxdx
dy1212 2 1224
2
2
xdx
yd
0 occur when inflection of points Possible2
2
dx
yd
01224 .. xei
2
1x
x
2
2
dx
yd0
2
1
2
1
(-1) (0)
(-12) (12)
concavityin change a is there
2
1
inflection ofpoint a is 32
1
,
Inflection Points A point of inflection is where there is a change in concavity, to see if
there is a change, check either side of the point.
264 of point(s) inflection theFind e.g. 23 xxy
xxdx
dy1212 2 1224
2
2
xdx
yd
0 occur when inflection of points Possible2
2
dx
yd
01224 .. xei
2
1x
x
2
2
dx
yd0
2
1
2
1
(-1) (0)
(-12) (12)
concavityin change a is there
2
1
inflection ofpoint a is 32
1
,
Horizontal Point of Inflection; 0dx
dy0
2
2
dx
yd0
3
3
dx
yd
Alternative Way of Finding
Inflection Points
Alternative Way of Finding
Inflection Points
0 occur when inflection of points Possible2
2
dx
yd
Alternative Way of Finding
Inflection Points
0 occur when inflection of points Possible2
2
dx
yd
3 5 7
3 5 7
If the first non-zero derivative is of odd order,
i.e 0 or 0 or 0 etc
then it is a point of inflection
d y d y d y
dx dx dx
Alternative Way of Finding
Inflection Points
0 occur when inflection of points Possible2
2
dx
yd
3 5 7
3 5 7
If the first non-zero derivative is of odd order,
i.e 0 or 0 or 0 etc
then it is a point of inflection
d y d y d y
dx dx dx
4 6 8
4 6 8
If the first non-zero derivative is of even order,
i.e 0 or 0 or 0 etc
then it is not a point of inflection
d y d y d y
dx dx dx
24..3
3
dx
ydge
24..3
3
dx
ydge
024,2
1when
3
3
dx
ydx
24..3
3
dx
ydge
024,2
1when
3
3
dx
ydx
concavityin change a is there
24..3
3
dx
ydge
024,2
1when
3
3
dx
ydx
inflection ofpoint a is 32
1
,
concavityin change a is there
24..3
3
dx
ydge
024,2
1when
3
3
dx
ydx
inflection ofpoint a is 32
1
,
Exercise 10E; 1, 2bc, 3, 6ac,
7bd, 8, 10, 12, 14, 16, 18
concavityin change a is there