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¡Hola Rodrigo!
$$\begin{align}&13\left(\frac{1}{4}x^2-1\right)^2+5=\frac{17} {2}\\&\\&13\left(\frac{1}{4}x^2-1\right)^2=\frac{17} {2}-5\\&\\&13\left(\frac{1}{4}x^2-1\right)^2=\frac{7} {2}\\&\\&\left(\frac{1}{4}x^2-1\right)^2= \frac{7}{26}\\&\\&\frac{1}{4}x^2-1= \pm \sqrt{\frac{7}{26}}\\&\\& \frac{1}{4}x^2=1 \pm \sqrt{\frac{7}{26}}\\&\\&x^2= 4\pm \sqrt{\frac{7}{26}}\\&\\&x=\pm \sqrt{4\pm \sqrt{\frac{7}{26}}}\\&\\&\text{Y eso son 4 soluciones, las cuatro reales}\\&\\&x_1= \sqrt{4+ \sqrt{\frac{7}{26}}}\approx 2.125764456\\&\\&x_2= \sqrt{4- \sqrt{\frac{7}{26}}}\approx 1.865777446\\&\\&x_3= -\sqrt{4+ \sqrt{\frac{7}{26}}}\approx -2.125764456\\&\\&x_4= -\sqrt{4- \sqrt{\frac{7}{26}}}\approx -1.865777446\\&\\&\\&\end{align}$$
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