Question

F(x+5)=4x^2+2, maka f(4) adalah?

Answer 1

F (x + 5) = 4x² + 2

x + 5 = 4
x = 4 - 5
x = -1

f (-1) = 4(-1)² + 2
= 4 + 2
= 6

Answer 2

F(4) = F(-1+5)= 4(-1)^2+2 = 4+2 = 6