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(a + 1)(a – 1)(a2 + 1) = ?A. (a4 - 2a2 - 1)B. (a4 - a2 - 1)C. (a4 - 1)D. (a4 + 1) |
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Answer» We know that, From formula, (a + b)(a – b) = a2 – b2 (a + 1)(a – 1)(a2 + 1) = (a2 – 1)(a2+ 1) Again applying the formula, (a2 – 1)(a2+ 1) = (a2)2 – (12)2 = a4 – 1 |
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