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7. Algebraic Expression, Identities and Factorisation
Home · Class 8 · Maths · NCERT - Exemplar Mathematics · 7. Algebraic Expression, Identities and Factorisation
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Q81 of 128 Page 224

Add:

3a (2b + 5c), 3c (2a + 2b)

Here, 3a(2b + 5c) = 6ab + 15ac

3c(2a + 2b) = 6ac + 6bc


Hence the two polynomials to be added are 6ab + 15ac and


6ac + 6bc



The result is as follows 6ab + 21ac + 6bc


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81

Add:

2p4 – 3p3 + p2 – 5p + 7, -3p4-7p3-3p2-p-12

81

Add:

3a(a-b-c), 2b (a-b + c)

82

Subtract:

5a2b2c2 from -7a2b2c2

82

Subtract:

6x2 – 4xy + 5y2 from 8y2 + 6xy – 3x2

Questions · 128
7. Algebraic Expression, Identities and Factorisation
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