Answer:
1) C.) -11
2) C.) 8x² + 12x
3) B) -11
Step-by-step explanation:
1)
f(x) = x + 4
f(3) = 3 + 4 = 7
g(x) = 12x - 6
g(-1) = 12(-1) - 6 = -12 - 6 = -18
f(3) + g(-1) = 7 + (-18) = -11
2)
f(x) = 2x + 3, g(x) = 4x
f(x) · g(x) = (2x + 3)(4x) use the distributive property
f(x) · g(x) = (2x)(4x) + (3)(4x)
f(x) · g(x) = 8x² + 12x
3)
f(x) = 2x - 3
f(2) = 2(2) - 3 = 4 - 3 = 1
g(x) = 4x
g(3) = 4(3) = 12
f(2) - g(3) = 1 - 12 = -11
