rozwiąż równania wielomianowe:
a) x³-7x²+2x-14=0
b) (x²-25)(x²+5x)(x²+5)(x²-10x+25)=0
c)(x²-x-2)(2x²+x+5)(14+5x-x²)=0
d)x³+2²=3x
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a) x³-7x²+2x-14=0
x²(x-7)+2(x-7)=(x-7)(x²+2) x=7
b) (x²-25)(x²+5x)(x²+5)(x²-10x+25)=0
x=5 x=-5 x=0
c)(x²-x-2)(2x²+x+5)(14+5x-x²)=0
(x-1)² x=1 x=-1 Δ=1-40=-39 Δ=25+56=81 √Δ=9 x=-5+9/2=2 x=-5-9/2=-7
d)x³+2²=3x
x³+2x²-3x=0
x(x²+2x-3)=0
x=0 Δ=4+12=16 √Δ=4 x=-2+4/2=1 x=-2-4/2=-3