Solve for the roots of x in each of the equations below. x4 - 81 = 0 x4 + 10x2 + 25 = 0 x4 - x2 - 6 = 0

Hi, i actually had the same question, and here's my answer, though my teacher graded this problem half, so i would suggest researching and asking for .  a: x^4-81=0x^4=81x=3, x=-3b: x^4  + 10x^2  + 25 = 0x^4+10x^2=-25x=i√5, -i√5c: x^4  -  x^2  - 6 = 0(x^2)^2-x^2-6=0x^2-x-6=0x^2= 3, x^2=2√3, -√3, i√2, -i√2i'm pretty confident that the first two are correct. it's the third one though that i still need (because i'm retaking it) and would suggest to study and look for the right answer. hoped i , and let me know how it goes!