Question

find all numbers for which the rational expression is undefined (t^3-2t)/(t^2-49)

Answer 1

t(t*2 -2)=0 --- t_1=0 --- t*2 = 2 --- t_2,_3 =+/- radical 2
t*2 -49 =0
t*2 =49
t_4,_5 = +/- 7
- so for those solutions will be undefined this expression .