Question

Subtract 8a-7ab-20 from 20a-9ab-20​

Answer 1

Answer:

20a - 9ab - 20 - ( 8a - 7ab - 20)

20a - 9ab - 20 - 8a + 7ab + 20

20a - 8a - 9ab + 7ab - 20 + 20

12a - 2ab.

Ans) 12a - 2ab is the correct answer.

Answer 2

20a - 9ab - 20 - (8a - 7ab - 20) =  12a - 2ab

Given:

Subtract 8a-7ab-20 from 20a-9ab-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-20 from 20a-9ab-20​

20a - 9ab - 20 - (8a - 7ab - 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 - 20 - 8a + 7ab + 20

Step 3:

Collect like terms and calculate

20a  - 8a - 9ab + 7ab - 20  + 20

12a - 2ab

Hence, 20a - 9ab - 20 - (8a - 7ab - 20) =  12a - 2ab