What is the integral of e^{4x}4 ?

The integral of e^{4x}4 is e^{4x}+C

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integral of e^{4x}4

\int e^{4 x} 4 d x

e^{4 x} + C

Solution steps

\int e^{4 x} \cdot 4 d x

Take the constant out:

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

= 4 \cdot \int e^{4 x} d x

Apply u-substitution

= 4 \cdot \int e^{u} \frac{1}{4} d u

Take the constant out:

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

= 4 \cdot \frac{1}{4} \cdot \int e^{u} d u

Use the common integral:

\int e^{u} d u = e^{u}

= 4 \cdot \frac{1}{4} e^{u}

Substitute back

u = 4 x

= 4 \cdot \frac{1}{4} e^{4 x}

Simplify

4 \cdot \frac{1}{4} e^{4 x} : e^{4 x}

= e^{4 x}

Add a constant to the solution

= e^{4 x} + C