Question

(х2-9)2- 4(х2 -9)+3=0

Answer 1

(x2-9)2-4(x2-9)=-3
(2-4)(x2-9)=-3
-2(2x-9)=-3
-2-9=3/2(дробь)
2х=3/2+9
2х=21/2(дробь)
х=21/4
х=5,24