How to do f(-3) in functions

To find f(-3) in a function, you would substitute -3 in place of the variable in the function equation and then solve for the resulting expression.

For example, if the function is f(x) = 2x + 5, to find f(-3), you would substitute -3 in place of x:

f(-3) = 2(-3) + 5
f(-3) = -6 + 5
f(-3) = -1

Therefore, f(-3) in the function f(x) = 2x + 5 is -1.