9. Rozwiąż równania:
a) x(x - 6) + 14 = 5


Odpowiedź :

[tex]a)\\\\x(x-6)+14 = 5\\\\x^{2}-6x+14-5 = 0\\\\x^{2}-6x+9 = 0\\\\(x-3)^{2} = 0\\\\x-3 = 0\\\\\boxed{x_{o} = 3}[/tex]