Factorise 9x ^2 +3x -8y -64y ^2
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=9x^2+3x-8y-64y^2
=9x^2-64y^2+3x-8y
=(3x)^2-(8y)^2-3x-8y
=(3x-8y)(3x+8y)-1(3x+8y)
=(3x+8y)(3x-8y-1)
=9x^2-64y^2+3x-8y
=(3x)^2-(8y)^2-3x-8y
=(3x-8y)(3x+8y)-1(3x+8y)
=(3x+8y)(3x-8y-1)
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