Question

Choose the correct simplification of (2x^3 + x^2 − 4x) − (9x^3 − 3x^2).

11x^3 − 2x^2 − 4x

−7x^3 + 4x^2 − 4x

−2x^3 − 2x^2 − 4x

−7x^3 − 4x^2 − 4x

Answer 1

B

Answer 2

(2x^3 -9x^3)+(x^2-3x^2)-4x = -7x^3 +4x^2-4x

Answer 3

second 1

Answer 4

(\[(11x^3-9x^3)+(x^2-(-3x^2) +(-4x-0)\]

Answer 5

replace 11 with 2 -_-

Answer 6

B

Answer 7

What you want to do is called "grouping like terms."
Basically that's a fancy way of saying, "if the exponent is the same, add 'em together."
So, for example, you could rewrite
3x^2 + 2x^2
as
(3+2)x^2 = 5x^2