Answer:
f(4)=28
Step-by-step explanation:
Let f(x) = 3x + x², find f(4).
f(x) is a function such that the value of x at any time gives the value of 3x + x².
So when we are given the value of f(x), we just input the value of x in the equation and solve. Assuming were looking for f(0),
f(0) = 3×0 + 0²= 0
From the question given
Let f(x) = 3x + x², find f(4)
we would put x=4 in 3x + x²
This would give 3×4 + 4²=12+16=28
So f(4) = 3×4 + 4²=12+16=28
