Zadanie 27. (2pkt)
Rozwiąż równanie 9.v3 +18.v2 - 4.v - 8 = 0.
9x3 + 18x2 - 4x - 8 = 0 (9x3 + 18x2) + (-4* - 8) = O 9x2 (x + 2) — 4(x + 2) = O (9x2 -4)(x + 2) = O (3x — 2)(3x + 2)(x + 2) = O <=>
3x — 2 = O V 3x + 2 = O V x + 2 = O
3x = 2 |
3x = -2 |
x = -2 |
2 |
2 | |
X = — |
X = —— |
x = -2 |
3 |
3 | |
+ 18x2 - |
4x - 8 = 0 <=> x = |
H- - |