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प्रश्न
Factorise the following, using the identity a2 + 2ab + b2 = (a + b)2.
9x2 + 30x + 25
उत्तर
We have,
9x2 + 30x + 25
= (3x)2 + 2 · 3x · 5 + 52
= (3x + 5)2
= (3x + 5)(3x + 5)
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