Hi yall im new to this forum but im looking for some help.
Find all values of the variable for which the expression is undefined.
1) (4y)/( x- 3)
2) (4x + 12)/ (x^3 - 9x)
3) (7)/ (7 -x )
4) (2y)/ (y^2 - 6y - 7)
5) (7)/ (x^2 -4)
6)(4x)/ (2x - 1)
Can u please help or teach me how 2 do it
We are looking for values of x where the expression is undefined. In the case of fractions we look for where the denominator is 0.
So for 1)
we know that is forbidden. Thus x = 3 is where the expression is undefined.
A more complicated example is number 4)
We are looking for places where
So y cannot be -1 or 7.
See what you can do with the rest.