please help me with my math

Question

if f(x)=-3x+4, what is the value of 2f(3)+f(-4)?

Answer 1

if f(x)=-3x+4, what is the value of 2f(3)+f(-4)?

f(3) = -3(3) + 4

f(3) = -9 + 4

f(3) = -5

f(-4) = -3(-4) + 4

f(-4) = 12 + 4

f(-4) = 16

Therefore, 2f(3)+f(-4) = 2(-5) + 16 = -10 +16 = 6.