Пусть x^2=y.
2)у^2-5х+6=0
у1=3,у2=2
х^2=3》х=sqrt3
x^2=2》x=sqrt2
3)y^2-8x-9=0
y1=9,y2=-1
x^2=9》x=+-3
x^2=-1》x=+-i
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Answers & Comments
Пусть x^2=y.
2)у^2-5х+6=0
у1=3,у2=2
х^2=3》х=sqrt3
x^2=2》x=sqrt2
3)y^2-8x-9=0
y1=9,y2=-1
x^2=9》x=+-3
x^2=-1》x=+-i