prosze o rozwiązanie zadan w załączniku
zad 1
=3*(-2)³+(-2)²-2*(-2)-3=3*(-8)+4+4-3=-24+4+4-3=-19
odp C
zad 3
2x³=4x²
2x³-4x²=0
2x²(x-2)=0
x=0 ∨ x=2
odp A i C
zad 4
x³-3x²-4x+12=0
x²(x-3)-4(x-3)=0
(x-3)(x²-4)=0
(x-3)(x-2)(x+2)=0
x=3 ∨ x=2 ∨ x=-2
odp A,B,C
zad 6
2x⁴-3x³-2x²=0
x²(2x²-3x-2)=0
x=0
Δ=(-3)²-4*2*(-2)=9+16=25
√Δ=5
x₁=(3+5)/4=2
x₂=(3-5)/4=-½
odp D
zad 7
x³-2x²-9x+18=
=x²(x-2)-9(x-2)=
=(x-2)(x²-9)=
=(x-2)(x-3)(x+3)
odp B
zad 8
zad 9
odp A
zad 10
(x³-1)(4x⁶-2x+1)(5x-3)=
=(4x⁹-2x⁴+x³-4x⁶+2x-1)(5x-3)=
=20x¹⁰......
zad 11
A)
10-x²=0
-x²=-10
x²=10
x=√10 ∨ x=-√10
B)
x³-3x²+x-3=0
x²(x-3)+1(x-3)=0
(x²+1)(x-3)=0
x=3
zad 12
a)
=9x²(2x+1)-9(2x+1)=
=(9x²-9)(2x+1)=
=(3x-3)(3x+3)(2x+1)
b)x²(3x-7)-9(3x-7)=
=(3x-7)(x²-9)=
=(3x-7)(x-3)(x+3)
c)
=5x²(2x+3)+4(2x+3)=
=(2x+3)(5x²+4)
d)
=x³(x+2)-1(x+2)=
=(x³-1)(x+2)
e)
=8x³(x+3)+1(x+3)=
=(x+3)(8x³+1)
x²(x-1)-1(x-1)=0
(x²-1)(x-1)=0
(x-1)(x+1)(x-1)=0
x=1 ∨ x=-1
b)
x(x²+6x+5)=0
Δ=6²-4*1*5=36-20=16
√Δ=4
x₁=(-6+4)/2=-1
x₂=(-6-4)/2=-5
x=0 ∨ x=-1 ∨ x=-5
x+1=0
x=-1
x²+1=0
x²=-1
brak rozwiązania
x²-9=0
x²=9
x=3 lub x=-3
x=-1 ∨ x=3 ∨x=-3
x²=0
x²+4=0
x²=-4
x=-1 ∨ x=2 ∨ x=5
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zad 1
=3*(-2)³+(-2)²-2*(-2)-3=3*(-8)+4+4-3=-24+4+4-3=-19
odp C
zad 3
2x³=4x²
2x³-4x²=0
2x²(x-2)=0
x=0 ∨ x=2
odp A i C
zad 4
x³-3x²-4x+12=0
x²(x-3)-4(x-3)=0
(x-3)(x²-4)=0
(x-3)(x-2)(x+2)=0
x=3 ∨ x=2 ∨ x=-2
odp A,B,C
zad 6
2x⁴-3x³-2x²=0
x²(2x²-3x-2)=0
x=0
Δ=(-3)²-4*2*(-2)=9+16=25
√Δ=5
x₁=(3+5)/4=2
x₂=(3-5)/4=-½
odp D
zad 7
x³-2x²-9x+18=
=x²(x-2)-9(x-2)=
=(x-2)(x²-9)=
=(x-2)(x-3)(x+3)
odp B
zad 8
odp C
zad 9
odp A
zad 10
(x³-1)(4x⁶-2x+1)(5x-3)=
=(4x⁹-2x⁴+x³-4x⁶+2x-1)(5x-3)=
=20x¹⁰......
odp A
zad 11
A)
10-x²=0
-x²=-10
x²=10
x=√10 ∨ x=-√10
B)
x³-3x²+x-3=0
x²(x-3)+1(x-3)=0
(x²+1)(x-3)=0
x=3
odp B
zad 12
a)
=9x²(2x+1)-9(2x+1)=
=(9x²-9)(2x+1)=
=(3x-3)(3x+3)(2x+1)
b)x²(3x-7)-9(3x-7)=
=(3x-7)(x²-9)=
=(3x-7)(x-3)(x+3)
c)
=5x²(2x+3)+4(2x+3)=
=(2x+3)(5x²+4)
d)
=x³(x+2)-1(x+2)=
=(x³-1)(x+2)
e)
=8x³(x+3)+1(x+3)=
=(x+3)(8x³+1)
zad 12
a)
x²(x-1)-1(x-1)=0
(x²-1)(x-1)=0
(x-1)(x+1)(x-1)=0
x=1 ∨ x=-1
b)
x(x²+6x+5)=0
Δ=6²-4*1*5=36-20=16
√Δ=4
x₁=(-6+4)/2=-1
x₂=(-6-4)/2=-5
x=0 ∨ x=-1 ∨ x=-5
c)
x+1=0
x=-1
x²+1=0
x²=-1
brak rozwiązania
x²-9=0
x²=9
x=3 lub x=-3
x=-1 ∨ x=3 ∨x=-3
d)
x²=0
x=0
x²+1=0
x²=-1
brak rozwiązania
x²+4=0
x²=-4
brak rozwiązania
x=0
e)
x=-1 ∨ x=2 ∨ x=5