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!

Idon’t know the answer to this

These are the multiples of 15 but what you are probably asking or what are the factors of 15