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Anonymous
(2x+1)(2x+3) when factored
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You can factor a five out of 15 plus 5x. Therefore, 15 plus 5x factors out to 5(3+x). Hope it helps :)
2x2+13x+15 = (2x+3)(x+5)
x2 + 8x + 15 = (x + 3) (x + 5).
(x+3)(x+15)
(z + 15)(z + 3)