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प्रश्न
Expand the following:
(a + 3b)2
योग
उत्तर
Using (x + y)2
= x2 + 2xy + y2, we get
(a + 3b)2
= a2 + 2(a)(3b) + (3b)2
= a2 + 6ab + 9ab2.
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