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Expand the brackets: (x-3)(x+4)

First Multiply x by (x +4) Next multiply -3 by(x+4) Then simplify the sum : x²+4x-3x-12 Hence the answer is : x²+x-12

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You are told that y is proportional to x^2 and that y=75, x=5. Find a formula for y in terms of x.

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