Split the second term in 4x^2 + 17x - 15 into two terms
4x^2 + 20x - 3x - 15
Factor out the common terms in the first two terms, then in the last two terms.
4x(x + 5) -3(x + 5)
Factor out the common term x + 5
(x + 5)(4x - 3)
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