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Using identity a2 – b2 = (a + b) (a – b) find the product(i) (2a + 7) (2a – 7)(ii) (p2 + q2) (p2 – q2) |
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Answer» (i) (2a + 7) (2a – 7) = (2a)2 – (1)2 = 22a2 – 72 = 4a2 – 49 (ii) (p2 + q2) (p2 – q2) = (p2)2 – (q2)2 = p4 – q4 |
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