Question

Me ajudem resolver essa equação biquadrada


4x4-5x2+9=0

Answer 1

4x-5x=-4-2-9
-x=-15 (-1)
x=15

Answer 2

Resposta:

$4x^4-5x^2+9=0\\\\u^2-5u+9=0\\\\u=\frac{5}{8}+i\frac{\sqrt{119}}{8},\:u=\frac{5}{8}-i\frac{\sqrt{119}}{8}\\\\x=\frac{\sqrt{17}}{4}+\frac{\sqrt{7}}{4}i,\:x=-\frac{\sqrt{17}}{4}-\frac{\sqrt{7}}{4}i,\:x=-\frac{\sqrt{17}}{4}+\frac{\sqrt{7}}{4}i,\:x=\frac{\sqrt{17}}{4}-\frac{\sqrt{7}}{4}i$