Question

subtract 8a-7ab+3b-20 from 20a -9ab+5b-20

Answer 1

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Answer 2

20a - 9ab + 5b - 20 - (8a - 7ab + 3b - 20) =  12a - 2ab+2b

Given:

Subtract 8a-7ab+3b-20 from 20a-9ab+5b-20​

To Find:

Evaluate

Solution:

Like Terms:

Like terms are the terms whose variables and their exponents are the same.

Step 1:

Write as an expression Subtract 8a-7ab+3b-20 from 20a-9ab+5b-20​

20a - 9ab +5b - 20 - (8a - 7ab + 3b- 20)

Step 2:

Remove the parenthesis

When there is a - in front of an expression in parentheses, change the sign of each term in the expression

20a - 9ab + 5b - 20 - 8a + 7ab -3b + 20

Step 3:

Collect like terms and calculate

20a  - 8a - 9ab + 7ab + 5b - 3b - 20  + 20

12a - 2ab + 2b

Hence, 20a - 9ab + 5b - 20 - (8a - 7ab + 3b - 20) =  12a - 2ab+2b