Solve 16^x=1/64

$$16 ^ { x } = \frac { 1 } { 64 }$$

Solve for x

$$x = -\frac{3}{2} = -1\frac{1}{2} = -1.5$$

Steps Using Definition of Logarithm

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

$$16^{x}=\frac{1}{64}$$

Take the logarithm of both sides of the equation.

$$\log(16^{x})=\log(\frac{1}{64})$$

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

$$x\log(16)=\log(\frac{1}{64})$$

Divide both sides by \log(16).

$$x=\frac{\log(\frac{1}{64})}{\log(16)}$$

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

$$x=\log_{16}\left(\frac{1}{64}\right)$$

Solve for x (complex solution)

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

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