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Question
Factorise the following:
y2 – 16y – 80
Solution
Product = – 80, sum = – 16
Split the middle term as – 20y and 4y
y2 – 16y – 80 = y2 – 20y + 4y – 80
= y(y – 20) + 4(y – 20)
= (y – 20)(y + 4)
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