Write in Standard Form (2x^2-7x^3+8x)+(-8x^3-3x^2+4)

$(2 x^{2} - 7 x^{3} + 8 x) + (- 8 x^{3} - 3 x^{2} + 4)$

To write a polynomial in standard form, simplify and then arrange the terms in descending order.

$a x^{2} + b x + c$

Subtract $3 x^{2}$ from $2 x^{2}$ .

$- 7 x^{3} + 8 x - 8 x^{3} - x^{2} + 4$

Subtract $8 x^{3}$ from $- 7 x^{3}$ .

$- 15 x^{3} + 8 x - x^{2} + 4$

Move $8 x$ .

$- 15 x^{3} - x^{2} + 8 x + 4$