SOLUTION: this has to do with rational expressions. 2y + 1 over y^2 - y - 6 numbers that cannot be used in place of the variable in the expression. I am lost on my whole chapter with

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: this has to do with rational expressions. 2y + 1 over y^2 - y - 6 numbers that cannot be used in place of the variable in the expression. I am lost on my whole chapter with       Log On


   

Question 242087: this has to do with rational expressions.
2y + 1 over y^2 - y - 6
numbers that cannot be used in place of the variable in the expression.
I am lost on my whole chapter with rational expressions.
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
%282y+%2B+1%29%2F%28y%5E2+-+y+-+6%29
numbers that cannot be used in place of the variable in the expression.
:
Assume you know that you cannot have the value of 0 in the denominator
Another words if y^2 - y - 6 = 0 that is value for y that is forbidden
:
To find out what that is, we just set the denominator expression to = 0
Find out what value(s) of y that will be
:
y^2 - y - 6 = 0
Factor this to
(y-3)(y+2) = 0
two solutions
y = 3
y = -2
:
the answer is that y = 3 and y = -2 are values that cannot be used