Rozwiąż równanie :
( chciałabym obliczenia wszystkie )
a).2x(do piątej)-18x³+2x²-18=0
b) 4x³-14x²+6x-21=0
c) 15x(do piątej)-10x⁴-6x+4=0
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a)
2x⁵-18x³+2x²-18=0
2x³(x²-9)+2(x²-9)=0
(2x³+2)(x²-9)=0
2(x³+1)(x-3)(x+3)=0
2(x+1)(x²-x+1)(x-3)(x+3)=0
x+1=0 lub x²-x+1=0 lub x-3=0 lub x+3=0
x=-1 brak x=3 x=-3
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b)
4x³-14x²+6x-21=0
2x²(x-7)+3(2x-7)=0
(2x²+3)(2x-7)=0
2x²+3=0 lub 2x-7=0
brak x=7/2
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c)
15x⁵-10x⁴-6x+4=0
5x⁴(3x-2)-2(3x-2)=0
(5x⁴-2)(3x-2)=0
(x⁴-2/5)(3x-2)=0
(x²-√(2/5))(x²+√(2/5))(3x-2)=0
(x-√(√(2/5)))(x+√(√(2/5)))(x²+√(2/5))(3x-2)=0
x-√(√(2/5))=0 lub x+√(√(2/5))=0 lub x²+√(2/5)=0 lub 3x-2=0
x=√(√(2/5)) x=-√(√(2/5)) brak x=2/3