(x+5)^2=20

Question

Solve Principle of square roots

Answer 1

(x + 5)² = 20

x + 5 = √20 = 2√5

You need to consider both √5 and -√5.

Case 1.

x + 5 = 2√5

x = 2√5 - 5

Case 2.

x + 5 = -2√5

x = -2√5 - 5