Answer: -3c^2+6 Step-by-step explanation: The equation will be identity (0=0) when M is equal to the contents of the parentheses. That polynomial can be used directly, or it can be simplified by combing the c^2 terms.
The contents of parentheses simplify as follows: (4c^2 - 7c^2 +6)=(c^2(4 -7)+6)=(-3c^2 +6)