Factorise 2 x squared minus 7 x minus 15
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2x^2-7x-15
=2x^2-10x+3x-15
=2x(x-5)+3(x-5)
=(2x+3)(x-5)
=2x^2-10x+3x-15
=2x(x-5)+3(x-5)
=(2x+3)(x-5)
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