g(x) = x - 3
f(x) = 2x³
to find g(4), replace x = 4 in g(x) formula, as follows:
g(4) = 4 - 3 = 1
(f+g)(x) = f(x) + g(x) = 2x³ + x - 3
f(0)+g(2) = 2(0)³ + (2) - 3 = 2 - 3 = -1
f(3)+g(0) = 2(3)³ + (0) - 2 = 2(27) - 2 = 54 - 2 = 52
f(-1) -f(1)+g(2) = 2(-1)³ - 2(1)³ + 2 - 3 = 2(-1) - 2(1) + 2 - 3 = -2 - 2 + 2 - 3 = -5