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Home > A2C > Chapter 11 > Lesson 11.3.2 > Problem 11-149

11-149.
  1. Solve and check each equation. Homework Help ✎

Square each side.
Set the equation equal to zero
Factor the equation.

x + 20 = x2
0 = x2x − 20

x = 5

Here is the start of the process.
Complete the rest and check all possible answers.

x = 3 x = 11