Rozwiąż równianie (postaraj się wybrać jak najprostszą metodę);
a.2x²-7=0
b.x(5-2x)=0
c.(x-3)(2x+1)=0
d.x-3x²=0
e.x²-2x+1=0
f.(3x-1)²=0
g.(5x)²=7
h.x²-x√2-1=0
i.x(x-4)=8
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a.2x²-7=0
2x² = 7
x²=3½
x=√3½ ∨ x=-√3½
b.x(5-2x)=0
x=0 ∨ 5-2x=0
-2x=-5
x=2,5
c.(x-3)(2x+1)=0
x-3=0 ∨ 2x+1=0
x=3 x=-½
d.x-3x²=0
x(1-3x)=0
x=0 ∨ 1-3x=0
-3x=-1
x=⅓
e.x²-2x+1=0
(x-1)²=0
x=1
f.(3x-1)²=0
3x-1=0
3x=1
x=⅓
g.(5x)²=7
25x²=7
x³=7/25
x=√7/5 ∨ x=-√7/5
h.x²-x√2-1=0
Δ=(-√2)²-4*1*(-1)=2+4=6
√Δ=√6
i.x(x-4)=8
x²-4x-8=0
Δ=(-4)²-4*1*(-8)=16+32=48
√Δ=4√3