Question

Myra’s tutor used these steps to solve the problem 10x^2=90.

• Divide both sides by 10 to get x^2=9.
• Take square roots on both sides to get x=±3.
Using this method, what is the solution to 7x^2=1008?

±
3

± 3

±
7

A. ± 7
B. ±12
C. ± 12
D. ±144

Answer 1

Explanation:

7x² = 1008

divide both sides by 7:

x² = 144

x = ±√144 = ±12