What is the integral from 1 to 4 of 4x ?

The integral from 1 to 4 of 4x is 30

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integral from 1 to 4 of 4x

\int_{1}^{4} 4 x d x

30

Solution steps

\int_{1}^{4} 4 x d x

Take the constant out:

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

= 4 \cdot \int_{1}^{4} x d x

Apply the Power Rule

= 4 [\frac{x ^{2}}{2}]_{1}^{4}

Compute the boundaries:

\frac{15}{2}

= 4 \cdot \frac{15}{2}

Simplify

= 30

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