Question 879614
Plug in {{{y = 0}}} and solve for x.



{{{y = (x + a)/(x + b) }}}



{{{0 = (x + a)/(x + b) }}}



{{{0(x + b) = x + a }}}



{{{0 = x + a }}}



{{{x + a = 0}}}



{{{x = -a}}}



So the root or zero of the function is {{{x = -a}}}