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The square of (5a + 4b) - (5a-b) (5a + b) =?
(5a+4b)^2-(5a-b)(5a+b)
=(25a^2+16b^2+40ab)-(25a^2-b^2)
=17b^2+40ab
2x^2-7x-15＝(2x-3)(x+5)
You get (2x + 5) (x-3)
2x^2-7x-15＝(2x+3)(x-5)
7x=2x+15
7x=2x+15
7x-2x=15
5x=15
x=3
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