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

Answer:

Option 4th or the marked option is correct.

Step-by-step 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.