a) 64a^2-9 b) 81x^4-121

Factor the difference squares. | Wyzant Ask An Expert

Inactive Tutor answered • 04/28/16

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a) 64a^2-9 = (8a-3)(8a+3)

b) 81x^4-121 = (9x² - 11)(9x² + 11)

It will help you immensely if you memorize the squares of all integers from 2 to 25. Example: 64a² = [8a]²

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