Janek191:
| | 4 x2 | |
x2 + |
| < 5 ; x ≠ −2 |
| | (x + 2)2 | |
x
2 *( x + 2)
2 + 4 x
2 < 5*( x + 2)
2
x
2 *( x
2 + 4 x + 4) + 4 x
2 < 5*( x
2 + 4 x + 4)
x
4 + 4 x
3 + 4 x
2 + 4 x
2 < 5 x
2 + 20 x + 20
x
4 + 4 x
3 + 3 x
2 − 20 x − 20 < 0
( x + 1)*( x
3 + 3 x
2 − 20) < 0
( x + 1)*( x − 2)*(x
2 + 5x + 10) < 0 ; x
2 + 5x + 10 > 0 bo Δ = 25 − 40 < 0
itd.