liczba -3 jest pierwiastkiem wielomianu W(x) = x do trzeciej + akwadrat razy xkwadrat + (a-1)x - 6. Oblicz a.
- 3 jest pierwiastkiem wielomianu W, zatem
W( - 3) = 0
Mamy więc
( -3)^3 + a^2 *( -3)^2 + (a -1)*( -3) - 6 = 0
- 27 + 9 a^2 - 3 a + 3 - 6 = 0
9 a^2 - 3 a - 30 = 0 / : 3
3 a^2 - a - 10 = 0
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delta = ( -1)^2 - 4*3*( -10) = 1 + 120 = 121
p ( delty) = 11
a = [ 1 - 11]/6 = - 10/6 = - 5/3
lub
a = [ 1 + 11]/6 = 12/6 = 2
Odp. a = - 5/3 lub a = 2
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- 3 jest pierwiastkiem wielomianu W, zatem
W( - 3) = 0
Mamy więc
( -3)^3 + a^2 *( -3)^2 + (a -1)*( -3) - 6 = 0
- 27 + 9 a^2 - 3 a + 3 - 6 = 0
9 a^2 - 3 a - 30 = 0 / : 3
3 a^2 - a - 10 = 0
----------------------
delta = ( -1)^2 - 4*3*( -10) = 1 + 120 = 121
p ( delty) = 11
a = [ 1 - 11]/6 = - 10/6 = - 5/3
lub
a = [ 1 + 11]/6 = 12/6 = 2
Odp. a = - 5/3 lub a = 2
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