Question

(х2 + 3)2 – 11(х2 + 3) + 28 = 0;

Answer 1

/-это чирта дроби

(x2+3)2-11(x2+3)+28=0

(2-11)×(x×2+3)=-28

-9(x×2+3)=-28

2x+3=28/9

2x=28/9-3

2x=1/9

x=2:1/9

x=1/18