By using standard formulae, expand the following:
(x-2y)(x-3y)
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We know that (x-a)(x-b) = x2 - (a + b)x + ab
∴ (x-2y)(x-3y) = x2 - (2y + 3y)x + (2y)(3y)
= x2 - 5xy + 6y2
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(x+3)(x-5)
(x-7)(x+9)
(x - 2y - z)2
(2x - 3y + 4z)2