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प्रश्न
Expand the following:
(a + 4) (a + 7)
योग
उत्तर
(a + 4) (a + 7)
= a2 + 4a + 7a + 28
= a2 + 11a + 28
(Using identity : (x + a) (x + b)
= x2 + (a + b) x + ab).
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