Question

If f(x)=x^2-2x, find: f(-4)=?

Answer 1

(f-4) = 24

Explanation:

f(x)=x^2-2x.

The given function is a function of x such that the value of the function at any time is determined by the value of x at that time. Therefore, the value of the function is determined by substituting a value for x in the equation, x^2-2x

We want to determine f(-4)

From the information given, x would take the value of -4

So x = -4. Therefore, we will substitute x = - 4 into equation x^2-2x

This becomes

f (-4) = (-4^2) - (2 × -4)

f(-4) = 16 + 8

(f-4) = 24

So the value of the function, f(x)=x^2-2x at (f-4) is 24