Question

Give an example of a function using the variable x and explain how we evaluate a function for a given value of x

Answer 1

Take a function f that represents the area of a square with a side's length x. We can write:
\[f(x)=x^2.\]

Answer 2

If we have a square whose side is 4 cm, we can find its area by plugging into the function:
\[\text{area}=f(4)=(4\text{cm})^2=16\text{cm}^2.\]