
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