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प्रश्न
Factorise the following, using the identity a2 + 2ab + b2 = (a + b)2.
x2 + 14x + 49
उत्तर
We have,
x2 + 14x + 49
= x2 + 2 · 7 · x + 72
= (x + 7)2
= (x + 7)(x + 7)
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