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Question
Factorise the following expressions using (a – b)3 = a3 – 3a2b + 3ab2 – b3 identity
y3 – 18y2 + 108y – 216
Sum
Solution
y3 – 18y2 + 108y – 216
= y3 – 3y2(6) + 3(6)2y – 63
= (y – 6)3
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Factorise Using the Identity (a – b)3
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