Liczba 2 jest pierwiastkiem wielomianu W (x) = x3 + ax2 + 6x − 4 . Ile jest równy współczynnik a ??
W(x) = x³ + ax² + 6x − 4
W(2) = 8 + 4a + 12 - 4
0 = 16 + 4a
-16 = 4a
a = -4
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W(x) = x³ + ax² + 6x − 4
W(2) = 8 + 4a + 12 - 4
0 = 16 + 4a
-16 = 4a
a = -4