Хстеп4-22хстеп2-75=0

Question

Хстеп4-22хстеп2-75=0

Answer 1

X⁴-22x²-75=0⇒x²=y⇒y²-22y-75=0;y₁=11+√121+75=11+14=25;y₂=11-14=-3
x²=25;x₁=5;x₂=-5;x²≠-3