sguo1111
sguo1111
29-02-2020
Mathematics
contestada
Factor the expression 16a^2 -81
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guskarose
guskarose
29-02-2020
According to short multiplication formula - different of squares:
a² − b² = (a − b)(a + b)
16a² - 81 = (4a)² - 9² = (4a - 9)(4a + 9)
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