SOLUTION: I need this worked out so I can understand. I am to find out which humbers cannot be used in place of the variable the rational expression. Please write it so I can understand it b

Algebra ->  Customizable Word Problem Solvers  -> Misc -> SOLUTION: I need this worked out so I can understand. I am to find out which humbers cannot be used in place of the variable the rational expression. Please write it so I can understand it b      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 383300: I need this worked out so I can understand. I am to find out which humbers cannot be used in place of the variable the rational expression. Please write it so I can understand it because I do not understand or know how to do this.
2y+1/y^2-y-6
Thank you so much.
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
find out which numbers cannot be used in place of the variable the rational expression.
Assume it is:
%28%282y%2B1%29%29%2F%28%28y%5E2-y-6%29%29
Remember that division by 0 is not permitted,
Therefore the denominator cannot equal 0
Find these forbidden values for y:
y^2 - y - 6 = 0
Factors to
(y-3)(y+2) = 0
Two solutions
y = +3
y = -2
These two values for y cannot be used
:
:
Check this, substitute these two values in y^2 - y + 6, confirm that it equals 0
:
Was this understandable to you?