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ac = 8(-15) = - 120
b = 14 = ( 20- 6)
8x^2 + 14xy - 15y^2 = (x+ 20/8 y) ( x- 6/8 y)=
= (x + 5/2 y)(x- 3/4y)
= (2x + 5y)(4x -3y)