Question

What are the solutions of the equation x^2-1=15

Answer 1

Answer: x = +4 or -4

Explanation:

x² - 1 = 15

x² = 15 + 1

x² = 16

Therefore, to solve for x we take the square root of both side

√x² = +/-√16

x² = +/-4

so, x = +4 or -4