factorise 10xsquar-x-3
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10x^2-x-3
=10x^2+5x-6x-3
=5x(2x+1) -3(2x+1)
=(2x+1) (5x-3)
=10x^2+5x-6x-3
=5x(2x+1) -3(2x+1)
=(2x+1) (5x-3)
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