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Question
Factorise the following by grouping the terms:
x2 - (p + q)x + pq
Sum
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Solution
x2 - (p + q)x + pq
= x2 - px - qx + pq
= (x2 - px) - (qx + pq)
= x(x - p) - q(x - p)
= (x - p)(x - q).
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Factorisation by Grouping
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