unit 2 rational expressions review - math (tlss)...2 6 9 b) ( 3)2 4 x c) 2 2 9 9 x x d) 2 2 1 x x 4....
TRANSCRIPT
MCR3U1 Name:_______________________________
Date:________________________________
1
Unit 2 – Rational Expressions REVIEW
PART 1: KNOWLEDGE AND UNDERSTANDING
1. The correct product of )2)(2(
)1)(5(
)1)(1(
)2)(3(
aa
aa
aa
aasimplifies fully to the form:
a) )2)(1(
)5)(3(
aa
aa b)
)2)(1(
)5)(3(
aa
aa
c) )2)(1(
)5)(3(
aa
aa d)
)2)(1(
)5)(3(
aa
aa
2. Which expression has restrictions 2,2 mm ?
a) m
m
m
m
6
)2(4
2
3
b)
)2(2
5
2
10
mm
m
c) )1(3
12
)12(
)13(
mm
m
m
m d)
)2(
)5(
4
)3(52
m
m
m
mm
3. Which rational expression has no restrictions?
a) x
xx
4
962 b)
2)3(
4
x c)
2
2
9
9
x
x
d)
2
2
1 x
x
4. Given the rational expression xx
x
63
52
the restrictions on the variable are:
a) 3x and 0x b) 2x and 2x
c) 2x and 0x d) 0x
5. The lowest common denominator required to perform the operation 65
14
3
32
xx
x
x
xis:
a) )3()2( 2 xx b) )3)(2( xx
c) )3)(2( xx d) )2)(65( 2 xxx
6. The rational expression 1
12
x
xcan be reduced to the form:
a) 1
1
x b) 1x c)
)1)(1(
)1(
xx
x d)
1
1
x
MCR3U1 Name:_______________________________
2
7. The quotient 22 4
2
9
31
xx
x
has a total of:
a) Two restrictions b) Three restrictions c) Four restrictions d) Five restrictions
8. Simplify fully and state restrictions. You must show how you:
Factored fully including: common factors, simple trinomials, decomposition,
difference of squares
Reduced each rational expression to lowest terms (where applicable)
Simplified fully (either by reducing, multiplying/dividing, or adding/subtracting)
a) 132
12
2
xx
x
b) 158)3(
22
xx
x
x
c) )4(4
)7(
127
1492
2
x
xx
xx
xx
d)
232
22
24
)3)(12(
2
12
2 xx
xx
xx
xx
x
x
9. In each of the examples below errors were made. Either the final answer is wrong, or the
restriction is wrong, or both. Correct all errors for each rational expression.
a) ,1
3
3
y
y
0y b) ,1
16
)4(2
2
y
y
4y
MCR3U1 Name:_______________________________
3
10. The length of a flag can be represented by the expression x39 and the area can be
represented by the expression 63303 2 xx respectively.
a) Write a simplified expression to represent the width of the flag. State
restrictions.
b) Find a simplified expression to represent the perimeter of the flag.
c) Do any restrictions on the variable apply? Justify.
11. Write a single rational expression with the two restrictions 0x and 2
1x
.
12. Solve for x if the reciprocal of
1
1
x is -2.
MCR3U1 Name:_______________________________
4
13. Simplify fully and state the restrictions. Show your factored steps, but not your factoring work.
a)
24xy 2z 3
16x 3yz b)
20mn
24n2´
3n
5m2
c)
2a2 + ab - 3b2
b2 - a2 d)
1 +1
x
1 -1
x 2
14. Simplify fully and state all restrictions.
w 2 + 4w - 21
w 2 + 2w - 35¸
9w 2 - 1
3w 2 - 16w + 5
MCR3U1 Name:_______________________________
5
15. Simplify and reduce fully, and state all restrictions.
y + 4
y 2 + y - 2-
6
y 2 - 5y - 14
PART 2: APPLICATION
16. A rectangular prism has length =
2x - 5
x + 4, width =
3x + 2
3x - 1, and height =
x + 4
3x + 1, all in metres.
a) Determine a simplified expression for the volume of the rectangular prism. Express your
answer as a quotient of two polynomials in standard (not factored) form, and state any
restrictions.
b) Determine the volume when x = 4 metres.
MCR3U1 Name:_______________________________
6
17. There are 2 rational expressions, P/Q and R/S, where Q = x2 – 16, R = x + 2, and
S = x2 – x – 12. If P/Q + R/S = A/B, where A = 6x2 + 19x + 2, determine an expression for P.
18. The area of a rectangular field is given by the expression x2 + 8x + 15.
a) Determine the expressions that represent the dimensions of the field.
b) Determine a fully simplified expression for the perimeter of the field.
MCR3U1 Name:_______________________________
7
PART 3: THINKING
14. Given triangle ABC below, determine a simplified expression that represents the perimeter
of ABC . State restrictions, if any.
62
1
g
g
B
1g
g
C
A
3
1
g
g
MCR3U1 Name:_______________________________
8
15. Hanz and Franz are walking 60 km to raise money to fight Breast Cancer. Franz walks 1 km/h
faster than Hanz, but stops for 30 min to sign autographs. They start at the same time, but Franz
finishes 2 ½ hours before Hanz. How fast was each person walking, and how long did it take for each
person to finish the walk?