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(x[do kwadratu]-2[do kwadratu])(x-3)-9=0
(x[do kwadratu]+4)(x-3)-9=0
x[do szescianu]+4x-3x[do szescianu]-12-9=0
x[do szescianu]+4x-3x[do szescianu]=12+9
-2x[do szescianu]+4x=21
3x^2-3x-13=0
3x^2-3x=13 :3
x^2-x=13/3
^- oznacza do potęgi
13/3- ułamek