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=5x⁷-10x⁵-x³-½x+2,5
2) (⅘x-8x³)-(⅖x⁵-⅗x+2-8x³)=⅘x-8x³-⅖x⁵+⅗x-2+8x³=
=-⅖x⁵+7/5x-2
3)-x(x⁴-8x³-5)+4x⁴(3x-2)=-x⁵+8x⁴+5x+12x⁵-8x⁴=11x⁵+5x
1)x³+4x²+x+4=x²(x+4)+1(x+4)=(x+4)(x²+1)
2)6x³-5x²+6x-5=x²(6x-5)+1(6x-5)
3)x³-5x²-3x-15=x²(x-5)+3(x-5)=(x-5)(x²+3)
4)2x³-3x²-6x+9=x²(2x-3)-3(2x-3)=(2x-3)(x²-3)
1)x3+4x2+x+4
( x3+4x2)+(x+4)
x2(x+4)+(x+4)
(x2+1)(x+4)
x2=-1-sprzeczność i x=-4
2)6x3-5x2+6x-5
(6x3-5x2)+(6x-5)
x2(6x-5)+(6x-5)
(x2+1)(6x-5)
x2=-1 - sprzeczność i 6x=5
x=6/5
3)x3-5x2-3x-15
(x3-5x2)-(3x-15)
x2(x-5)-3(x-5)
(x2-3)(x-5)
x2=3 i x=5
x=pod pierwiastkiem 3 i -3