Question

Subtract (-8+2x^3) from (3x^3-4-3x)

Answer 1

3x^3-4-3x-(-8+2x^3)
-> 3x^3-4-3x+8-2x^3
-> x^3-3x+4

Answer 2

$\to \sf(3x^3-4-3x) - (-8+2x^3)$

$\to \sf(3x^3-4-3x) + 8 - 2x^3$

$\to \sf3x^3-4-3x + 8 - 2x^3$

$\to \sf3x^3 - 2x^3-3x +4$

$\to \sf x^3-3x +4$