SOLUTION: can someone please help me. A. Find the corresponding y values for x=-2,-1,0,1,2,3,if y=x^2-x-2 answer(fill in y column) x___________ _y -2 -1 0 1 2 3 B. use microsoft e

Algebra ->  Quadratic Equations and Parabolas -> SOLUTION: can someone please help me. A. Find the corresponding y values for x=-2,-1,0,1,2,3,if y=x^2-x-2 answer(fill in y column) x___________ _y -2 -1 0 1 2 3 B. use microsoft e      Log On


   

Question 111767: can someone please help me.
A. Find the corresponding y values for x=-2,-1,0,1,2,3,if y=x^2-x-2
answer(fill in y column)
x_____________y
-2
-1
0
1
2
3
B. use microsoft exel to plot the points found in part A and to sketch the graph.
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!

f%28x%29=x%5E2-1x-2 Start with the given function.


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


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


f%28-2%29=%284%29%2B2-2 Multiply -1 and -2 to get 2


f%28-2%29=4 Now combine like terms


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


f%28x%29=x%5E2-1x-2 Start with the given function.


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


f%28-1%29=%281%29-1%28-1%29-2 Evaluate %28-1%29%5E2 to get 1.


f%28-1%29=%281%29%2B1-2 Multiply -1 and -1 to get 1


f%28-1%29=0 Now combine like terms


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


f%28x%29=x%5E2-1x-2 Start with the given function.


f%280%29=%280%29%5E2-1%280%29-2 Plug in x=0. In other words, replace each x with 0.


f%280%29=%280%29-1%280%29-2 Evaluate %280%29%5E2 to get 0.


f%280%29=%280%29%2B0-2 Multiply -1 and 0 to get 0


f%280%29=-2 Now combine like terms


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


f%28x%29=x%5E2-1x-2 Start with the given function.


f%281%29=%281%29%5E2-1%281%29-2 Plug in x=1. In other words, replace each x with 1.


f%281%29=%281%29-1%281%29-2 Evaluate %281%29%5E2 to get 1.


f%281%29=%281%29-1-2 Multiply -1 and 1 to get -1


f%281%29=-2 Now combine like terms


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


f%28x%29=x%5E2-1x-2 Start with the given function.


f%282%29=%282%29%5E2-1%282%29-2 Plug in x=2. In other words, replace each x with 2.


f%282%29=%284%29-1%282%29-2 Evaluate %282%29%5E2 to get 4.


f%282%29=%284%29-2-2 Multiply -1 and 2 to get -2


f%282%29=0 Now combine like terms


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


f%28x%29=x%5E2-1x-2 Start with the given function.


f%283%29=%283%29%5E2-1%283%29-2 Plug in x=3. In other words, replace each x with 3.


f%283%29=%289%29-1%283%29-2 Evaluate %283%29%5E2 to get 9.


f%283%29=%289%29-3-2 Multiply -1 and 3 to get -3


f%283%29=4 Now combine like terms




Now lets make a table of the values we have calculated 



 xy



 -24
 

 -10
 

 0-2
 

 1-2
 

 20
 

 34
Now plot the points



Now connect the points to graph y=x%5E2-x-2 (note: the more points you plot, the easier it is to draw the graph)