Question

solve, 4x8 + 12x4 +36 =0

Answer 1

start by factoring 4

Answer 2

and notice that it doesnt have any sing changes, in f(x) or f(-x) so you would get all imaginary roots. be prepared for that

Answer 3

4x8 + 12x4 +36 =0

4(x8 + 3x4 +9) = 0

x8 + 3x4 + 9 = 0

Answer 4

plugin x4 = t, then u wud see a quadratic, apply quadratic formula and solve t

Answer 5

thanks a lot ganeshie8,if you don't mind could you solve it i compare my answer with yours,pliz

Answer 6

rest is pretty straightforward, you can use wolfram to compare your answers

Answer 7

http://www.wolframalpha.com/input/?i=4x%5E8%2B12x%5E4%2B36%3D0

Answer 8

thanks

Answer 9

you're wlcme :) there are no real solutions, oly imaginary solutions you would get when u apply quadratic formula. good luck !