Zadania w załączniku.
zad 4
a) x³+4x²-2x-8=0
x²(x+4)-2(x+4)=0
(x+4)*(x²-2)=0
x=-4 v x=√2 v x=-√2
b) x³-3x²+4x-12=0
x²(x-3)+4(x-3)=0
(x²+4)*(x-3)=0
x=3 ( x²≠-4, bo to sprzeczność)
c) x⁵+4x³-x²-4=0
x³(x²+4)-1(x²+4)=0
(x³-1)*(x²+4)=0
x=1
d) 3x³+5x²-12x-20=0
3x(x²-4)+5(x²-4)=0
(3x+5)*(x²-4)=0
x=-5/3 v x=2 v x=-2
zad 5
a)2x⁵+3x⁴-2x-3=0
2x(x⁴-1)+3(x⁴-1)=0
(2x+3)*(x⁴-1)=0
x=1 v x=-1 v x=-3/2
b)5x⁵+4x⁴-5x-4=0
5x(x⁴-1)+4(x⁴-1)=0
(x⁴-1)*(5x+4)=0
x=1 v x=-1 v x=-4/5
c)3x⁵-2x⁴+3x-2=0
3x(x⁴+1)-2(x⁴+1)=0
(x⁴+1)(3x-2)=0
x=2/3
d)2x⁶-8x⁴-2x²+8=0
2x⁴(x²-4)-2(x²-4)=0
(2x⁴-2)(x²-4)=0
x=2 v x=-2 v x=1 v x=-1
zad6
a)(2x-5)(9x²-4)= (9x²-4)(x-8) /:(9x²-4)
2x-5=x-8
x=-3
b)(4x-3)(x²-4)=(3x²-12)(3+2x)
(4x-3)(x²-4)=3(x²-4)(3+2x) /: (x²-4)
4x-3=3(3+2x)
4x-3=9+6x
2x=-12
x=-6
c)(2x-1)(x²-1)=6(x+1)
(2x-1)(x-1)(x+1)=6(x+1) /:x+1
(2x-1)(x-1)=6
2x²-2x-x+1-6=0
2x²-3x-5=0
Δ=9+40=49 √Δ=7
x₁=5/2 v x₂=-1
d)(3x+1)(x²-9)=4(3-x)
(3x+1)*-1(3-x)(x+3)=4(3-x) /:(3-x)
(3x+1)*-1(x+3)=4
(3x+1)*(-x-3)=4
-3x²-9x-x-3-4=0
-3x²-10x-7=0
Δ=100-84=16 √Δ=4
x₁= -14/6 v x₂=-1
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zad 4
a) x³+4x²-2x-8=0
x²(x+4)-2(x+4)=0
(x+4)*(x²-2)=0
x=-4 v x=√2 v x=-√2
b) x³-3x²+4x-12=0
x²(x-3)+4(x-3)=0
(x²+4)*(x-3)=0
x=3 ( x²≠-4, bo to sprzeczność)
c) x⁵+4x³-x²-4=0
x³(x²+4)-1(x²+4)=0
(x³-1)*(x²+4)=0
x=1
d) 3x³+5x²-12x-20=0
3x(x²-4)+5(x²-4)=0
(3x+5)*(x²-4)=0
x=-5/3 v x=2 v x=-2
zad 5
a)2x⁵+3x⁴-2x-3=0
2x(x⁴-1)+3(x⁴-1)=0
(2x+3)*(x⁴-1)=0
x=1 v x=-1 v x=-3/2
b)5x⁵+4x⁴-5x-4=0
5x(x⁴-1)+4(x⁴-1)=0
(x⁴-1)*(5x+4)=0
x=1 v x=-1 v x=-4/5
c)3x⁵-2x⁴+3x-2=0
3x(x⁴+1)-2(x⁴+1)=0
(x⁴+1)(3x-2)=0
x=2/3
d)2x⁶-8x⁴-2x²+8=0
2x⁴(x²-4)-2(x²-4)=0
(2x⁴-2)(x²-4)=0
x=2 v x=-2 v x=1 v x=-1
zad6
a)(2x-5)(9x²-4)= (9x²-4)(x-8) /:(9x²-4)
2x-5=x-8
x=-3
b)(4x-3)(x²-4)=(3x²-12)(3+2x)
(4x-3)(x²-4)=3(x²-4)(3+2x) /: (x²-4)
4x-3=3(3+2x)
4x-3=9+6x
2x=-12
x=-6
c)(2x-1)(x²-1)=6(x+1)
(2x-1)(x-1)(x+1)=6(x+1) /:x+1
(2x-1)(x-1)=6
2x²-2x-x+1-6=0
2x²-3x-5=0
Δ=9+40=49 √Δ=7
x₁=5/2 v x₂=-1
d)(3x+1)(x²-9)=4(3-x)
(3x+1)*-1(3-x)(x+3)=4(3-x) /:(3-x)
(3x+1)*-1(x+3)=4
(3x+1)*(-x-3)=4
-3x²-9x-x-3-4=0
-3x²-10x-7=0
Δ=100-84=16 √Δ=4
x₁= -14/6 v x₂=-1