A2-4=0

Add 4 to both sides of the equation.

A2=4

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

A=±4

Simplify the right side of the equation.

Rewrite 4 as 22.

A=±22

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

A=±2

A=±2

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=2

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

A=-2

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

A=2,-2

A=2,-2

A=2,-2

Solve for A A^2-4=0