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Question
Factorise the following.
18 + 11x + x2
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Solution
We have,
18 + 11x + x2
= x2 + 11x + 18
= x2 + (9 + 2)x + 18
= x2 + 9x + 2x + 18
= x(x + 9) + 2(x + 9)
= (x + 9)(x + 2)
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