Wyznacz wartość współczynnika m, wiedząc że liczba 3 jest pierwiastkiem wielomianu.
W(x)=x^3-2x+mx+18
x=30=3³-2*3+3m+18-3m=27-6+18-3m=27+12-3m=39m=-13
W(x) = x^3 -2x + mx + 18
W(3) = 3^3 - 3*2 + 3m + 18
0 = 27- 6 + 3m +18
0=3m + 39
3m = -39 => m = -13
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x=3
0=3³-2*3+3m+18
-3m=27-6+18
-3m=27+12
-3m=39
m=-13
W(x) = x^3 -2x + mx + 18
W(3) = 3^3 - 3*2 + 3m + 18
0 = 27- 6 + 3m +18
0=3m + 39
3m = -39 => m = -13