Question

(4x^2 + 15x - 3)-(-3x^2 + 5)

Answer 1

Combine like terms.
4x^2+ (_3x^2)
no like term for 15x
-3-5
So it's 7x^2+15x-8

Answer 2

Subtracting polynomials is like subtracting real numbers; to subtract a real number you added the opposite of that number, to subtract a polynomial you add the opposite of each term of that polynomial and then simplify.

Answer 3

Thanks! onepeiceFTW