Answer:
-6a2+7ab+b2
Step-by-step explanation:
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- 6a^2 + 7ab + b^2
3b^2 + 4ab - 2a^2 - ( 4a^2 - 3ab + 2b^2 )
= 3b^2 + 4ab - 2a^2 - 4a^2 + 3ab - 2b^2
= 3b^2 - 2b^2 - 2a^2 - 4a^2 + 4ab + 3ab
= 1b^2 - 6a^2 + 7ab
= - 6a^2 + 7ab + b^2
