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Question
Factorise.
x2 − 10x + 9
Sum
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Solution
x2 − 10x + 9
= x2 − (9 + 1)x + 9
= x2 − 9x − 1x + 9
= x (x − 9) − 1 (x − 9)
= (x − 1) (x − 9)
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