Question

Rozwiąż: x^4 - 25x^2 + 144 = 0

Answer 1

X^4-25x²+144=0
x^4-9x²-16x²+144=0
x²(x²-9)-16(x²-9)=0
(x²-16)(x²-9)=0
x²-16=0 ν x²-9=0
x=4 ν x=-4 , x=3 ν x=-3