Question

36x⁴ - 13x²+1=0  URGENTE

Answer 1

$36x^4 - 13x^2+1=0\\ \\ \boxed{y=x^2}\\ \\ 36y^2-13y+1=0\\ \\ \Delta=(-13)^2-4.36.1=169-144=25\\ \\ y=\frac{13 \pm 5}{72}\\ \\ y_1=\frac{1}{9}\\ \\ y_2=\frac{1}{4}\\ \\ x^2=\frac{1}{9}\rightarrow x=\pm \frac{1}{3}\\ \\ x^2=\frac{1}{4}\rightarrow x=\pm \frac{1}{2}$