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A (A2 + A + 1) + 5 and Find Its Values For A = 0, A = 1, A = − 1. - Mathematics

a (a2 + a + 1) + 5 and find its values for (1) a = 0, (2) a = 1, (3) a = − 1.

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Solution

a (a2 + a + 1) + 5 = a3 + a2 + a + 5

1) For a = 0, a3 + a2 + a + 5 = 0 + 0 + 0 + 5 = 5

2) For a = 1, a3 + a2 + a + 5 = (1)3 + (1)2 + 1 + 5

= 1 + 1 + 1 + 5 = 8

(3) For a = −1, a3 + a2 + a + 5 = (−1)3 + (−1)2 + (−1) + 5

= − 1 + 1 − 1 + 5 = 4

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APPEARS IN

NCERT Class 8 Maths Textbook
Chapter 9 Algebraic Expressions and Identities
Exercise 9.3 | Q 4.2 | Page 146
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