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Question
Factorise the following.
y2 + 7y + 12
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Solution
We have,
y2 + 7y + 12
= y2 + (4 + 3)y + 12
= y2 + 4y + 3y + 12
= y(y + 4) + 3(y + 4)
= (y + 4)(y + 3)
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