Odpowiedź :
[tex]x^4-25x^2 + 144=0\\\\x^4-9x^2-16x^2+144=0\\\\x^2(x^2-9)-16((x^2-9)=0\\\\(x^2-9)(x^2-16)=0\\\\(x-3)(x+3)(x-4)(x+4)=0\\\\x=3\ \ \ lub\ \ \ x=-3\ \ \ lubx=4\ \ \ lub\ \ \ x=-4[/tex]
[tex]x^4-25x^2 + 144=0\\\\x^4-9x^2-16x^2+144=0\\\\x^2(x^2-9)-16((x^2-9)=0\\\\(x^2-9)(x^2-16)=0\\\\(x-3)(x+3)(x-4)(x+4)=0\\\\x=3\ \ \ lub\ \ \ x=-3\ \ \ lubx=4\ \ \ lub\ \ \ x=-4[/tex]