Sahib tried four different solutions to the matching problem. Which of his four answers is correct?
Simplified Expression
2a²-8a+7
2a²-3a+7
-2a²-4a+7
-2a²+2a+7
Expression
3a²+5a-1-5a²-3a+8
3a²+4a+6-a²-7a+1
-7a²-9a+4+5a² +5a+3
a²-6a+2+ a²-2a+5