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Question
Factorise the following by grouping the terms:
9 + 3xy + x2y + 3x
Sum
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Solution
9 + 3xy + x2y + 3x
= 9 + 3xy + 3x + x2y
= (9 + 3xy) + (3x + x2y)
= 3(3 + xy) + x(3 + xy)
= (3 + xy)(3 + x).
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Factorisation by Grouping
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