a4-256=0

Add 256 to both sides of the equation.

a4=256

Take the 4th root of both sides of the equation to eliminate the exponent on the left side.

a=±2564

Simplify the right side of the equation.

Rewrite 256 as 44.

a=±444

Pull terms out from under the radical, assuming positive real numbers.

a=±4

a=±4

The complete solution is the result of both the positive and negative portions of the solution.

First, use the positive value of the ± to find the first solution.

a=4

Next, use the negative value of the ± to find the second solution.

a=-4

The complete solution is the result of both the positive and negative portions of the solution.

a=4,-4

a=4,-4

a=4,-4

Solve for a a^4-256=0