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Question
Factorise the following expression.
y2 − 4
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Solution
y2 − 4
Let us identify a and b as the difference of squares.
a = y2
b = 22 = 4
= (y)2 − (2)2
a2 − b2 = (a + b) (a − b)
(y)2 − (2)2 = (y + 2) (y − 2)
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