Factorise x^2+5x-750
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x^2+30x-25x-750=x*(x+30)-25*(x+30)=(x+30)*(x-25)
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x^{2} +30x-25x-750
x(x+30)-25(x+30)
(x+30)(x-20)
x(x+30)-25(x+30)
(x+30)(x-20)
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