117k views
4 votes
Solve for X please


√(18 + x) = x - 2


User Imara
by
8.5k points

1 Answer

5 votes

Answer:

{-2, 7}

Explanation:

Square both sides of this equation. We get:

18 + x = x^2 - 4x + 4, which, in turn, simplifies to

x^2 - 5x - 14 = 0.

Note that 2 - 7 = -5 and that 2(-7) = -14.

Then x^2 - 5x - 14 = 0 => (x -7)(x + 2) = 0, which gives us the solutions -2 and 7.

User Yoni Roit
by
7.8k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories