| a+b | ||
(a−b)* | ||
| a+b |
| 2 n2 + 7 n + 11 − (2 n2 + 3 n) | ||
an = | = | |
| √2 n2 + 7 n + 11 + √2 n62 + 3 n |
| 4 n + 11 | ||
= | = | |
| √2n2 +7n +11 + √2n2 + 3 n |
| 4 + 11n | ||
= | ||
| √2 + 7n + 11n2 + √ 2 + 3n |
| 4 + 0 | 4 | 2 | ||||
lim an = | = | = | = √2 | |||
| √ 2 + 0 +0 + √2 + 0 | 2√2 | √2 |
| a2 − b2 | ||
a − b = | ||
| a + b |