6. f(x) = 4x2 + 2x – 7 and g(x) = 3x2 + x + 1, What is f(x) + g(x)
a. 7x2 + 3x – 6
c. 7x2 + 3x - 8
b. 7x2 + 2x – 6
d. 7x2 + 3x - 7