Question

If x = -3, find
pls answer

Answer 1

x² - 1 = 8

Explanation:

Given the following algebraic expression;

x² - 1

When x = -3

Substituting the value of x, we have;

x² - 1 = (-3)² - 1

x² - 1 = 9 - 1

x² - 1 = 8

Method II.

x² - 1 = (x - 1)(x + 1)

Substituting the value of x, we have;

x² - 1 = (-3 - 1)(-3+ 1)

x² - 1 = -4(-2)

x² - 1 = 8