dane są wielomiany w(x)=(x+1)(x+2)(x+3) oraz z(x)=x^3+(m+k)x^2+(2k-5m)x+6
a) wyznacz tak liczby a, b aby te wielomiany były równe
b) oblicz W(pierwiastek2-2)
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a)
W(x)=(x+1)(x+2)(x+3)
W(x)=(x²+3x+2)(x+3)
W(x)=x³+3x²+3x²+9x+2x+6
W(x)=x³+6x²+11x+6
Z(x)=x³+(m+k)x²+(2k-5m)x+6
m+k=6
2k-5m=11
2m+2k=12
5m-2k=-11
-----------------+
7m=1
m=¹/₇
{m=¹/₇
{k=5⁶/₇
b)
W(x)=x³+6x²+11x+6
W(√2-2)=(√2-2)³+6·(√2-2)²+11·(√2-2)+6=
=2√2-12+12√2-8+6(2+4-4√2)+11√2-22+6=
=25√2-36+36-24√2=√2