Question

Sahib tried four different solutions to the matching problem. Which of his four answers is correct?

Answer 1

your answer is correct

answer is D. last one.

Answer 2

Option 4th or the marked option is correct.

Explanation:

The expressions are:

1.
`3a^(2) +5a-1-5a^(2)-3a+8`

Simplifying this by grouping same coefficients we get,

`(3a^(2) -5a^(2))+(5a-3a)+(8-1)`

=
`-2a^(2) +2a+7`

2.
`3a^(2) +4a+6- a^(2)-7a+1`

`(3a^(2) -a^(2))+(4a-7a)+(6+1)`

=
`2a^(2) -3a+7`

3.
`-7a^(2)-9a+4+5a^(2)+5a+3`

`(-7a^(2) +5a^(2))+(5a-9a)+(4+3)`

=
`-2a^(2) -4a+7`

4.
`a^(2)-6a+2+a^(2)-2a+5`

`(a^(2)+a^(2))+(-6a-2a)+(5+2)`

=
`2a^(2) -8a+7`

So, comparing all the answers, we can see that option 4th or the marked one is the correct matching.