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. $-4 x^{4}+6 x^{3}+7 x^{2}-4 x-4$

Answer

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Answer

Simplify the result: $\boxed{-4 x^{4}+6 x^{3}+7 x^{2}-4 x-4}$

Steps

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: $\boxed{-4 x^{4}+6 x^{3}+7 x^{2}-4 x-4}$