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Question
Factorise the following:
t² + 72 – 17t
Solution
Product = +72, sum = –17
Split the middle term as – 9t and – 8t
t² – 17t + 72 = t² – 91 – 8t + 72
= t(t – 9) – 8(t – 9)
= (t – 9)(t – 8)
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