Addition of trinomials — task. Mathematics CBSE, Class 7.

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Add the following trinomials and select the correct answer.

The sum of

\begin{array}{l} x^{3} + 3 x^{2} - x; \\ 4 x^{3} + 2 x^{2} - x \end{array}

and

5 x^{2} - 3 x^{3} + 4 x

is...

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8. Addition of trinomials