Rozwiąż równania
a -5x4+3x3+14x2=0
b 4x3-14x2+6x-21=0
c 6x3+6x2-3x-3=0
d x5-6x4-40x3=0
Z góry dziekuje za pomoc
a)
-5x⁴+3x³+14x²=0
x²(-5x²+3x+14)=0
x²=0
x=0
Δ=3²-4*(-5)*14=9+280=289
√Δ=17
x₁=(-3+17)/-10=-1,4
x₂=(-3-17)/-10=2
x=0 ∨ x=1,4 ∨ x-2
b )
4x³-14x²+6x-21=0
2x²(2x-7)+3(2x-7)=0
(2x-7)(2x²+3)=0
2x-7=0
2x=7
x=3,5
2x²+3=0
2x²=-3
x²=-1,5 -> brak rozwiązania
c)
6x³+6x²-3x-3=0
6x²(x+1)-3(x+1)=0
(6x²-3)(x+1)=0
6x²-3=0
6x²=3
x²=½
x=√½ ∨ x=-√½
x+1=0
x=-1
x=√½ ∨ x=-√½ ∨ x=-1
d)
x⁵-6x⁴-40x³=0
x³(x²-6x-40)=0
Δ=(-6)²-4*1*(-40)=36+160=196
√Δ=14
x₁=(6+14)/2=10
x₂=(6-14)/2=-4
x=0 ∨ x=10 ∨x=-4
-5x⁴ + 3x³ + 14x² = 0
x²(-5x² + 3x + 14) = 0
x² = 0 lub -5x² + 3x + 14 = 0
x² = 0
x₁ = 0
-5x² + 3x + 14 = 0
Δ = 9 + 280 = 289; √Δ = 17
Odp. x₁ = 0; x₂ = 1,4; x₃ = - 2
b)
4x³ - 14x² + 6x - 21 = 0
2x²·(2x - 7) + 3·(2x - 7) = 0
(2x² + 3)(2x - 7) = 0
2x² + 3 = 0 lub 2x - 7 = 0
2x² + 3 = 0
2x² = - 3 /:2
x² = - 1,5
Równanie nie ma rozwiązań
2x - 7 = 0
2x = 7 /:2
x = 3,5
Odp. x = 3,5
6x³ + 6x² - 3x - 3 = 0
6x²·(x + 1) - 3·(x + 1) = 0
(6x² - 3)(x + 1) = 0
6x² - 3 = 0 lub x + 1 = 0
6x² - 3 = 0
6x² = 3 /:6
x² = ³/₆
x² = ½
x + 1 = 0
x₃ = - 1
Odp.
x⁵ - 6x⁴ - 40x³ = 0
x³·(x² - 6x - 40) = 0
x³ = 0 lub x² - 6x - 40 = 0
x³ = 0
x² - 6x - 40 = 0
Δ = 36 + 160 = 196; √Δ = 14
Odp. x₁ = 0; x₂ = - 4; x₃ = 10
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a)
-5x⁴+3x³+14x²=0
x²(-5x²+3x+14)=0
x²=0
x=0
Δ=3²-4*(-5)*14=9+280=289
√Δ=17
x₁=(-3+17)/-10=-1,4
x₂=(-3-17)/-10=2
x=0 ∨ x=1,4 ∨ x-2
b )
4x³-14x²+6x-21=0
2x²(2x-7)+3(2x-7)=0
(2x-7)(2x²+3)=0
2x-7=0
2x=7
x=3,5
2x²+3=0
2x²=-3
x²=-1,5 -> brak rozwiązania
x=3,5
c)
6x³+6x²-3x-3=0
6x²(x+1)-3(x+1)=0
(6x²-3)(x+1)=0
6x²-3=0
6x²=3
x²=½
x=√½ ∨ x=-√½
x+1=0
x=-1
x=√½ ∨ x=-√½ ∨ x=-1
d)
x⁵-6x⁴-40x³=0
x³(x²-6x-40)=0
x=0
Δ=(-6)²-4*1*(-40)=36+160=196
√Δ=14
x₁=(6+14)/2=10
x₂=(6-14)/2=-4
x=0 ∨ x=10 ∨x=-4
a)
-5x⁴ + 3x³ + 14x² = 0
x²(-5x² + 3x + 14) = 0
x² = 0 lub -5x² + 3x + 14 = 0
x² = 0
x₁ = 0
-5x² + 3x + 14 = 0
Δ = 9 + 280 = 289; √Δ = 17
Odp. x₁ = 0; x₂ = 1,4; x₃ = - 2
b)
4x³ - 14x² + 6x - 21 = 0
2x²·(2x - 7) + 3·(2x - 7) = 0
(2x² + 3)(2x - 7) = 0
2x² + 3 = 0 lub 2x - 7 = 0
2x² + 3 = 0
2x² = - 3 /:2
x² = - 1,5
Równanie nie ma rozwiązań
2x - 7 = 0
2x = 7 /:2
x = 3,5
Odp. x = 3,5
c)
6x³ + 6x² - 3x - 3 = 0
6x²·(x + 1) - 3·(x + 1) = 0
(6x² - 3)(x + 1) = 0
6x² - 3 = 0 lub x + 1 = 0
6x² - 3 = 0
6x² = 3 /:6
x² = ³/₆
x² = ½
x + 1 = 0
x₃ = - 1
Odp.
d)
x⁵ - 6x⁴ - 40x³ = 0
x³·(x² - 6x - 40) = 0
x³ = 0 lub x² - 6x - 40 = 0
x³ = 0
x₁ = 0
x² - 6x - 40 = 0
Δ = 36 + 160 = 196; √Δ = 14
Odp. x₁ = 0; x₂ = - 4; x₃ = 10