SOLUTION: Evaluate each function for x= -2, 0, and 5. 1.) y = 9+ x 2.) y = x^2 - 1 This is totally confusing me so I need help thanks!

Algebra ->  Functions -> SOLUTION: Evaluate each function for x= -2, 0, and 5. 1.) y = 9+ x 2.) y = x^2 - 1 This is totally confusing me so I need help thanks!      Log On


   

Question 115454: Evaluate each function for x= -2, 0, and 5.
1.) y = 9+ x
2.) y = x^2 - 1


This is totally confusing me so I need help thanks!
Found 2 solutions by jim_thompson5910, vertciel:
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
#1



Let's evaluate f%28-2%29


f%28x%29=9%2Bx Start with the given function.


f%28-2%29=9%2B-2 Plug in x=-2. In other words, replace each x with -2.


f%28-2%29=7 Now combine like terms


-----------Now let's evaluate another value---------


Let's evaluate f%280%29


f%28x%29=9%2Bx Start with the given function.


f%280%29=9%2B0 Plug in x=0. In other words, replace each x with 0.


f%280%29=9 Now combine like terms


-----------Now let's evaluate another value---------


Let's evaluate f%285%29


f%28x%29=9%2Bx Start with the given function.


f%285%29=9%2B5 Plug in x=5. In other words, replace each x with 5.


f%285%29=14 Now combine like terms





#2


Let's evaluate f%28-2%29


f%28x%29=x%5E2-1 Start with the given function.


f%28-2%29=%28-2%29%5E2-1 Plug in x=-2. In other words, replace each x with -2.


f%28-2%29=%284%29-1 Evaluate %28-2%29%5E2 to get 4.


f%28-2%29=3 Now combine like terms


-----------Now let's evaluate another value---------


Let's evaluate f%280%29


f%28x%29=x%5E2-1 Start with the given function.


f%280%29=%280%29%5E2-1 Plug in x=0. In other words, replace each x with 0.


f%280%29=%280%29-1 Evaluate %280%29%5E2 to get 0.


f%280%29=-1 Now combine like terms


-----------Now let's evaluate another value---------


Let's evaluate f%285%29


f%28x%29=x%5E2-1 Start with the given function.


f%285%29=%285%29%5E2-1 Plug in x=5. In other words, replace each x with 5.


f%285%29=%2825%29-1 Evaluate %285%29%5E2 to get 25.


f%285%29=24 Now combine like terms

Answer by vertciel(183) About Me  (Show Source):
You can put this solution on YOUR website!
Hello there,
Words can be intimidating sometimes.
All you need to do is substitute each value into the two equations:
So for x = -2:
1. f(x) = 9 + x
f(-2) = 9 + -2
= 7
2. f(x) = x^2 - 1
f(-2) = (-2)^2 - 1
= 3
Try the rest yourself. Write back if you need help.