top of page
EVALUATING FUNCTIONS
-IS JUST A MEANS OF SUBSTITUTION
​
IT IS A PROCESS OF DETERMINING THE VALUE OF THE FUNCTION AT THE NUMBER ASSIGNED TO A GIVEN VARIABLE.
​
F(x) IS THE NOTATION THAT REPRESENTS A FUNCTION OF X. YOU READ IT AS "F OF X"
EXAMPLES
If f(x) = x2 + 3, evaluate f(2)
f(2)= (2)2+3
f(2)= 4+3
f(2)= 7
​
What does this mean?
-It means when x=2, y=7
-It means the point (2,7) is on the graph
If f(x) = 2x3 + 4x - 6, evaluate f(-1)
f(-1)= 2(-1)3 + 4(-1) - 6
f(-1)= 2(-1) + 4(-1) - 6
f(-1)= -12
​
What does this mean?
-It means when x=-1, y=-12
-It means the point (-1, -12) is on the graph of f(x)
If g(x) = x2 + 2x, evaluate g(x-3)
g(x-3)= (x-3)2 + 2(x-3)
g(x-3)= (x2-6x+9) +2x-6
g(x-3)= x2-6x+9+2x-6
g(x-3)= x2 -4x =3
​
watch these videos to learn how to evaluate functions
bottom of page