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Factor the expression 16a^2 -81
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Factor the expression 16a^2 -81

User Jagjot
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1 Answer

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According to short multiplication formula - different of squares:

a² − b² = (a − b)(a + b)

16a² - 81 = (4a)² - 9² = (4a - 9)(4a + 9)

User Mansoor
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