(a - b)(a + b) = a2 - b2 (5b - 9)(5b + 9) = (5b)2 - 92 = 25b2 - 81

Multiply and simplify the expression.

Nataliya D. answered • 04/26/13

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(a - b)(a + b) = a² - b²
(5b - 9)(5b + 9) = (5b)² - 9² = 25b² - 81

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