123: (x − 3)(2x + 2) = (x − 3)(x
2 − 6) ⇒ (x − 3)(2x + 2) − (x − 3)(x
2 − 6) = 0
⇒ (x − 3)(2x + 2 − x
2 + 6) = 0 ⇒ (x − 3)(−x
2 + 2x + 8) = 0
Δ
x = 2
2 − 4*(−1)*8 ⇒ Δ
x = 4 + 32 ⇒ Δ
x = 36 ⇒
√Δx = 6
| | −2 − 6 | | −8 | |
x1 = |
| ⇒ x1 = |
| ⇒ x1 = 4 |
| | −2 | | −2 | |
| | −2 + 6 | | 4 | |
x2 = |
| ⇒ x2 = |
| ⇒ x2 = −2 |
| | −2 | | −2 | |
(x − 3)(x − 4)(x + 2) = 0
x
1= 3 v x
2 = 4 v x
3 = −2