16x2 - 25 = (4x + 5) ( 4x - 5)
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16x2 - 25 = (4x + 5) (4x - 5)
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4x times 4x equals 16x2.
factor the trinomial 16x^2+24x+9
There is a formula for the "difference of squares." In this case, the answer is (4x + 3)(4x - 3)