Question

Let f(x) = 3x + x², find f(4).

Answer 1

f(4) is equivalent to 28 because when you plug in 4 for the x, you get 28.

Answer 2

f(4)=28

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