Solve 25=17+2^x

$$25 = 17 + 2 ^ { x }$$

Solve for x

$$x=3$$

Steps Using Definition of Logarithm

Swap sides so that all variable terms are on the left hand side.

$$17+2^{x}=25$$

Use the rules of exponents and logarithms to solve the equation.

$$2^{x}+17=25$$

Subtract 17 from both sides of the equation.

$$2^{x}=8$$

Take the logarithm of both sides of the equation.

$$\log(2^{x})=\log(8)$$

The logarithm of a number raised to a power is the power times the logarithm of the number.

$$x\log(2)=\log(8)$$

Divide both sides by \log(2).

$$x=\frac{\log(8)}{\log(2)}$$

By the change-of-base formula \frac{\log(a)}{\log(b)}=\log_{b}\left(a\right).

$$x=\log_{2}\left(8\right)$$

Solve for x (complex solution)

$$x=\frac{2\pi n_{1}i}{\ln(2)}+3$$

$$n_{1}\in \mathrm{Z}$$