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put x^4=t^2 and try to solve

i still don't understand..

substitute x^4 = t^2
you get t^2 - 41t + 400 = 0
can u solve this quadratic equation

i can try i just dont understand algebra at all

BTW, there are 4 solutions and all of them are real. No imaginary zeros

thanks you guys i will try to figure it out!

try factoring
\[t^2-41t+400=0\] it actually factors

and a hint is that the two numbers whose product is 400 are both perfect squares

thank you very much for your help!

oh alrighty. thanks :)