Question

Solve : x^4-9x^2+8=0. Thanks.

Answer 1

x^4-9x^2+8=0

x^4-9x^2=-8

x^2(x^2-9)=-8

x^2[(x-3)(x+3)]=-8

can you take it form here?

Answer 2

Yes, thanks.

Answer 3

awesome, no problem.