(4x+5)^2 - (-3x+6)^2
16x^2 + 40x + 25 - 9x^2 + 36x - 36 =
= 7x^2 + 76x - 11 =
=(7x-1)*(x+11)
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(4x+5)^2 - (-3x+6)^2
16x^2 + 40x + 25 - 9x^2 + 36x - 36 =
= 7x^2 + 76x - 11 =
=(7x-1)*(x+11)