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प्रश्न
Factorise the following, using the identity a2 + 2ab + b2 = (a + b)2.
x2 + 2x + 1
उत्तर
We have,
x2 + 2x + 1
= x2 + 2 · 1 · x + 12
= (x + 1)2
= (x + 1)(x + 1)
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