diane yeoman definite integral the fundamental theorem
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Diane Yeoman
Definite IntegralThe Fundamental Theorem
Diane Yeoman
Integrals and Area
Integrals are used to find the area under a curve
As we used with our Reimann sum, we need to know where on the x-axis to start and stop our search for the area.When we do this, it is called a
Definite IntegralSince the integral has a definite start and
stop point.
Diane Yeoman
Definite Integral
A definite integral is shown as:
ab f(x) dx
Where a = the start point on the x-axis and b = the end point on the x-axis
This will replace the Riemann Sum method of finding the area under a curve.
Diane Yeoman
Definite Integral: Area under a curve
x=a x=b
On this curve, f(x), we can find the area under the curve using a definite integralFrom x=aTo x=bA definite integral is shown as:
ab f(x) dx
Diane Yeoman
Fundamental Theorem
A definite integral is evaluated as:
ab f(x) dx = F(b) – F(a)
Where F(b) is the integral of f(x) at the point
x=b, and F(a) is the integral of f(x) at the point
x=a
Diane Yeoman
Fundamental Theorem: Example
Calculate the definite integral:
05 e-2x dx
= (-1/2)e-2x |0
5
Find F(5): =(-1/2) e-2(5) =(-1/2) e-10
Find F(0): =(-1/2) e-2(0)
=(-1/2) e0
=-1/2Solve F(5) – F(0)
=(-1/2) e-10 - (1/2)
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