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Mathematics
Lorenzo Walters
2 October, 18:32
Factorise x2-22-+117
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1
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Gilberto Olson
2 October, 20:33
0
(x - 9) (x - 13)
Step-by-step explanation:
Find the factors of 117
1,117
3,39
9,13
Because 117 is positive, the factors are either both positive or both negative.
Find the pair which sums to - 22. Inorder to get to - 22, the factors must be negative.
-1 + - 117 = - 118
-3 + - 39 = - 42
-9 + - 13 = - 22
The correct factor is - 9,-13. Put it inside the brackets.
(x - 9) (x - 13)
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