What is the integral of (4-2x)^2 ?

The integral of (4-2x)^2 is -1/6 (4-2x)^3+C

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integral of (4-2x)^2

\int (4 - 2 x)^{2} d x

- \frac{1}{6} (4 - 2 x)^{3} + C

Solution steps

\int (4 - 2 x)^{2} d x

Apply u-substitution

= \int - \frac{u ^{2}}{2} d u

Take the constant out:

\int a \cdot f (x) d x = a \cdot \int f (x) d x

= - \frac{1}{2} \cdot \int u^{2} d u

Apply the Power Rule

= - \frac{1}{2} \cdot \frac{u ^{3}}{3}

Substitute back

u = 4 - 2 x

= - \frac{1}{2} \cdot \frac{( 4 - 2 x ) ^{3}}{3}

Simplify

- \frac{1}{2} \cdot \frac{( 4 - 2 x ) ^{3}}{3} : - \frac{1}{6} (4 - 2 x)^{3}

= - \frac{1}{6} (4 - 2 x)^{3}

Add a constant to the solution

= - \frac{1}{6} (4 - 2 x)^{3} + C