Q81 of 128 Page 224

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

The addition is as follows:

Here, 3a(a-b-c) = 3a²-3ab-3ac

2b(a-b + c) = 2ab-2b² + 2bc

Hence the two polynomials to be added are 3a²-3ab-3ac and

2ab-2b² + 2bc

The result is as follows 3a²-ab-3ac + 2bc

Add:

5x² – 3xy + 4y² – 9, 7y² + 5xy – 2x² + 13

Add:

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

Add:

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

Subtract:

5a²b²c² from -7a²b²c²

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