Question

Find the domain of the rational function 9x/(x+5)(x+3)

Answer 1

the domain is : D = ]-∞ , -5[ U ]-5 , -3[ U ]-3 , +∞[

Explanation:

hello :

f(x) = 9x/(x+5)(x+3)

f exist for : (x+5)(x+3) ≠ 0

(x+5)(x+3)=0

x+5=0 or x+3=0 means : x= - 5 or x= -3

the domain is : D = ]-∞ , -5[ U ]-5 , -3[ U ]-3 , +∞[