Rozwiąż równania i nierówności:
a) |3-2x| = 7
b) |3x-12| ≤ 6
c) (x-3)² = (2-3x)² - (x-2) (x+2)
d) 2x³ - x² + 4x - 2 = 0
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a) |3-2x| = 7
3-2x=7 lub 3-2x=-7
-4=2x lub -2x=-10
x=-2 lub x=5
b) |3x-12| ≤ 6
-6≤3x-12≤6
6≤3x≤18
2≤x≤6
c) (x-3)² = (2-3x)² - (x-2) (x+2)
x²-6x+9=4-12x+9x²-x²+4
x²-6x+9=8x²-12x+8
7x²-6x-1=0
Δ=36+28
√Δ=8
x₁=(6-8)/14=-1/7
x₂=(6+8)/14=1
d) 2x³ - x² + 4x - 2 = 0
x²(2x-1)+2(2x-1)=0
(x²+2)(2x-1)=0
2x-1=0
x=1/2