Conjecture: The product of a number (x - 1) and the number (x + 1) is always equal to ENTER ANSWER HERE

Answer:
x² - 1
Step-by-step explanation:
The product
(x - 1)(x + 1)
= x(x + 1) - 1(x + 1) ← distribute both parenthesis
= x² + x - x - 1 ← collect like terms
= x² - 1