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Question
Factorise the following expression.
p2 − q2
Sum
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Solution
p2 − q2
a = p, b = q
∴ a2 − b2 = (a + b) (a − b)
∴ (p)2 − (q)2 = (p + q) (p − q)
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| (a) `x/2` = 10 | (i) x = 4 |
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| (c) 2x − 5 = 3 − x | (iii) x = 20 |
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