1.

(a + 1)(a – 1)(a2 + 1) = ?A. (a4 - 2a2 - 1)B. (a4 - a2 - 1)C. (a4 - 1)D. (a4 + 1)

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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