B. The rational expression is not defined for any values of

20^2-180/4x^2+36+ 72

for which the denominator equals zero. Find the value(s) of for which the denominator equals zero.

3 answers

so, just solve
4x^2 + 36x + 72 = 0
x^2 + 9x + 18 = 0
That should help...
C. The company accountant says that the rational expression will never have a zero denominator because , the number of units, is always a whole number. Explain why the accountant is correct.

20^-180/4^2+36x+72

this is the second part can you help me
I have no idea .