Integration by Substitution

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# Integration by Substitution - PowerPoint PPT Presentation

Integration by Substitution. Undoing the Chain Rule TS: Making Decisions After Reflection &amp; Review. Objective. To evaluate integrals using the technique of integration by substitution. Warm Up. What is a synonym for the term integration?. Antidifferentation. What is integration?.

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### Integration by Substitution

Undoing the Chain Rule

TS: Making Decisions After Reflection & Review

Objective
• To evaluate integrals using the technique of integration by substitution.
Warm Up

What is a synonym for the term integration?

Antidifferentation

What is integration?

Integration is a process or operation that reverses differentiation.

The operation of integration determines the

original function when given its derivative.

Warm Up

3 problems:

Warm Up

You have already found a function whose derivative is the expression

in the integrand, so you already have an antiderivative.

Warm Up

Derivative of

inside function

Inside function

Some integrals are chain rule problems in reverse.

If the derivative of the inside function is sitting elsewhere

in the integrand, then you can use a technique called

integration by substitution to evaluate the integral.

Integration by Substitution
• One method for evaluating integrals involves untangling the chain rule.
• This technique is called integration by substitution.
• Integration by substitution is a technique for finding the antiderivative of a composite function.

CHAIN RULE

Integration by Substitution

Take the

derivative of u.

Substitute into

the integral.

Always express your

original variable.

Integration by Substitution

Take the

derivative of u.

Substitute into

the integral.

Always express your

original variable.

Integration by Substitution

Take the

derivative of u.

Substitute into

the integral.

Always express your

original variable.

Integration by Substitution
• Experiment with different choices for u when using integration by substitution.
• A good choice is one whose derivative is expressed elsewhere in the integrand.
Integration by Substitution

Always express your