Question

x4 - 10x2 + 9 = 0 find x

Answer 1

Answer:

x=1, x=-1,x=-3,x=3

Step-by-step explanation:

Answer 2

Answer:

x^4 -10x^2+9=0

Step-by-step explanation:

x^4-9x^2+x^2+9=0

x^2(x^2-9)-1(x^2-9)=0

(x^2-9)(x^2-1)=0

if x^2-9=0 or x^2-1= 0

x^2 =9 or x^2 =1

therefore, x= 3, x=1