Rozwiąż równania jak najprostszym sposobem :
2x^2 - 7 = 0
x^2 - 2x + 1 = 0
(5x)^2 = 7
x^2 - x*pierwiastek z 2 - 1 = 0
x^2 - 4x = 8
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1. 2x^-7=0
2x^=7
x^=3,5
x= - lub x=
2. delta=4-4=0
x=-b/2a=2/2=1
3. 25x^=7
x^=7/25
x= /5 lub x=- /5
4.delta=2+4=6
x1= (1- )/2 lub x=(1+ )/2
5. x^-4x-8=0
delta=16+32=48
x1=(4+ )/2 lub x2=(4- )/2