Simplify 9x^3-7x^2+4x^2-x+4x^3

$9 x^{3} - 7 x^{2} + 4 x^{2} - x + 4 x^{3}$

Add $9 x^{3}$ and $4 x^{3}$ .

$13 x^{3} - 7 x^{2} + 4 x^{2} - x$

Add $- 7 x^{2}$ and $4 x^{2}$ .

$13 x^{3} - 3 x^{2} - x$

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