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

3-129.

Square both sides of the equation.

4x2 = 8x + 12

Simplify and solve the resulting equation.

x2 − 2x − 3 = 0

x = 3. But, −1 does not work in the original equation.

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

6 = 6

−2 = 2