x2+144=400

Subtract 144 from both sides of the equation.

x2=400-144

Subtract 144 from 400.

x2=256

x2=256

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

x=±256

Simplify the right side of the equation.

Rewrite 256 as 162.

x=±162

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

x=±16

x=±16

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.

x=16

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

x=-16

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

x=16,-16

x=16,-16

x=16,-16

Solve Using the Square Root Property x^2+144=400