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Question
Factorise the following:
4x2 + 20x + 25
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Solution
4x2 + 20x + 25
= (2x)2 + 2 × 2x × 5 + (5)2
= (2x + 5)2 ...[Using identity, a2 + 2ab + b2 = (a + b)2]
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