For questions 2 and 3, simplify the polynomial.
2. 3x^2 + 6 - 2x + 5x - 4x^2 = 9
a. -x^2 + 3x + 15
b. 7x^2 + 3x + 3
c. x^2 - 3x + 15
d. -x^2 + 7x + 15
3. 3x^2 + 5x - 7x + 3 - 5x^2 + 2
a. -2x^2 + 2x + 5
b. -2x^2 - 2x + 5
c. 2x^2 - 2x + 5
d. 2x^2 + 2x + 5
