Jawabanmu

2014-05-02T15:35:27+07:00
lim x ->3 9 - x^2 per 4−√(x^2 + 7)
= lim   (9-x^2).(4+
√(x^2 + 7)) per (4−√(x^2 + 7)).(4+√(x^2 + 7))
x->3
= lim  
(9-x^2).(4+√(x^2 + 7)) per 16-(x^2+7)
x->3
= lim   
(9-x^2).(4+√(x^2 + 7)) per (9-x^2)
x->3
= lim   
(4+√(x^2 + 7))
x->3
= (4+
√(3^2+7)
= (4+√16) = 4+4 = 8

semoga membantu.