### Home > A2C > Chapter 3 > Lesson 3.2.3 > Problem 3-129

3-129.

Solve

Square both sides of the equation.

Simplify and solve the resulting equation.

. But,

Substitute each answer in the original equation. Only one of them will satisfy the equation.

3-129.

Solve

Square both sides of the equation.

Simplify and solve the resulting equation.

. But,

Substitute each answer in the original equation. Only one of them will satisfy the equation.