lim √9n2−8n+15 −3n =
n→∞
lim √9n2−8n+15 −3n * √9n2−8n+15 +3n/√9n2−8n+15 +3n =
n→∞
lim (√9n2−8n+15 −3n)(√9n2−8n+15 +3n)/√9n2−8n+15 +3n =
n→∞
lim 9n2−8n+15−9n2/√9n2−8n+15 +3n =
n→∞
I tutaj dalej nie wiem co robić
(wiem tylko że 9n2 się skrócą)
| √9n2−8n+15−3n | √9n2−8n+15+3n | |||
lim | * | = | ||
| 1 | √9n2−8n+15+3n |
| 9n2−8n+15−9n2 | ||
=lim | = | |
| √9n2−8n+15+3n |
| −8n+15 | ||
=lim | = | |
| n*(√9−(8/n)+(15/n2)+3) |
| n*(−8+15/n) | −8 | 8 | 4 | |||||
=lim | = | =− | =− | |||||
| n*(√9−(8/n)+(15/n2)+3) | √9+3 | 6 | 3 |