Problem
What is $\left(7 x^{2}-4\right)+\left(6 x^{3}-4 x-4 x^{4}\right)$ written in standard form ? A. $-4-4 x+7 x^{2}+6 x^{3}-x^{4}$ B. $4(-4-x)+x^{2}\left(7+6 x-x^{2}\right)$ C. $x^{4}+6 x^{3}+7 x^{2}-4 x-4$ D. $-4 x^{4}+6 x^{3}+7 x^{2}-4 x-4$
Solution
Step 1 ：Combine the given expressions: \(\left(7 x^{2}-4\right)+\left(6 x^{3}-4 x-4 x^{4}\right)\)
Step 2 ：Simplify the result: \(\boxed{-4 x^{4}+6 x^{3}+7 x^{2}-4 x-4}\)
