By using standard formulae, expand the following:
(x+3)(x-5)
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We know that (x+a)(x-b) = x2 + (a - b)x - ab
∴ (x+3)(x-5) = x2 + (3 - 5)x - (3)(5) = x2 - 2x - 15
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(x+3)(x+5)
(x-7)(x+9)
(x-2y)(x-3y)