Wyznacz wartośc parametru a tak , by liczba r była pierwaistkiem wielomianu W(x) jeśli :
a) W(x) =x⁴ +2x³ +ax -12 , r= -2
b) W(x) =x⁵+ax⁴+x²-x , r=-1
c)W(x) =x⁵+x³+ax²-8, r=2
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a)W(-2) = 0
16 - 16 -2a - 12 = 0
-2a = 12
a = -6
b) W(-1) = 0
-1 + a + 1 + 1 = 0
a = -1
c) W(2) = 0
32 + 8 + 4a - 8 = 0
4a = -32
a = -8