Take the natural logarithm of both sides of the equation to remove the variable from the exponent.
Expand by moving outside the logarithm.
Apply the distributive property.
Multiply by .
Move all the terms containing a logarithm to the left side of the equation.
Use the quotient property of logarithms, .
Subtract from both sides of the equation.
Divide each term by and simplify.
Divide each term in by .
Cancel the common factor of .
Cancel the common factor.
Divide by .
Move the negative in front of the fraction.
The result can be shown in multiple forms.
Solve for x 4^(x+1)=21