Solve 4(1/4)^x=8

$$4 ( \frac { 1 } { 4 } ) ^ { x } = 8$$

Solve for x

$$x=-\frac{1}{2}=-0.5$$

Steps Using Definition of Logarithm

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

$$4\times \left(\frac{1}{4}\right)^{x}=8$$

Divide both sides by 4.

$$\left(\frac{1}{4}\right)^{x}=2$$

Take the logarithm of both sides of the equation.

$$\log(\left(\frac{1}{4}\right)^{x})=\log(2)$$

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

$$x\log(\frac{1}{4})=\log(2)$$

Divide both sides by \log(\frac{1}{4}).

$$x=\frac{\log(2)}{\log(\frac{1}{4})}$$

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

$$x=\log_{\frac{1}{4}}\left(2\right)$$

Solve for x (complex solution)

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

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