factarise x2 + 7x - 18
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x² + 7x - 18
= x² + 9x - 2x - 18
= x(x + 9) - 2(x + 9)
= (x - 2)(x + 9).
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Answer:
x^2 + 7x - 18
= x^2 + 9x - 2x -18
=x(x + 9) - 2(x+ 9)
=(x + 9) (x - 2)
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