By using standard formulae, expand the following:
(x-7)(x+9)
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We know that (x-a)(x+b) = x2 - (a - b)x - ab
∴ (x-7)(x+9) = x2 - (7 - 9)x - (7)(9) = x2 + 2x - 63
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(x+3)(x+5)
(x+3)(x-5)
(x-2y)(x-3y)
(x - 2y - z)2