Question

How to solve (x-10)(x + 10)

Answer 1

x^2-100

Explanation:

Use the F.O.I.L method

x^2+100x-100x-100

Answer 2

x² - 100

Explanation:

Use the FOIL method. The FOIL method is the way in which you multiply the terms:

FOIL stands for First, Outside, Inside, Last. Multiply:

First:

x * x = x²

Outside:

x * 10 = 10x

Inside:

-10 * x = -10x

Last:

-10 * 10 = -100

Combine like terms:

x² + 10x - 10x - 100

x² + (10x - 10x) - 100

x² - 100

x² - 100 is your answer.

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