
Home > A2C > Chapter 11 > Lesson 11.3.2 > Problem 11-149
11-149.
Square each side.
Set the equation equal to zero
Factor the equation.
x + 20 = x2
0 = x2 − x − 20
x = 5
Here is the start of the process.
Complete the rest and check all possible answers.
x = 3 x = 11