Question

20. The value of (a + 1) (a - 1)(a + 1) is (a" - 1). true or false​

Answer 1

Step-by-step explanation:

Given, (a+1)(a−1)(a2+1).

We know, (a+b)(a−b) =(a2−b2).

Multiply by using direct method, we get,

(a+1)(a−1)(a2+1)=[a2−12](a2+1)

=(a2+1)(a2−1)

Now, by using formula (a2−b2)=(a+b)(a−b), we get,

=((a2)2−(1)2)

=a4−1.

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