\( \begin{array}{ll}4-5 x^{2}+4=0 & \text { b) } x^{4}-13 x^{2}+36= \\ 4-29 x^{2}+100=0 & \text { d) } x^{4}-8 x^{2}-9=0 \\ 4 x^{2}+4=0 & \text { f) } x^{4}+4 x^{2}+3=0\end{array} \)
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To solve the equation \(4 - 5x^{2} + 4 = 0\), first simplify it: \(8 - 5x^{2} = 0\), which leads to \(5x^{2} = 8\) or \(x^{2} = \frac{8}{5}\). Thus, \(x = \pm\sqrt{\frac{8}{5}} = \pm\frac{2\sqrt{2}}{\sqrt{5}}\). For the equation \(x^{4} - 13x^{2} + 36 = 0\), let \(y = x^{2}\). This converts the equation into a quadratic: \(y^{2} - 13y + 36 = 0\). Factoring gives \((y - 9)(y - 4) = 0\), yielding \(y = 9\) or \(y = 4\), and thus, \(x^{2} = 9 \Rightarrow x = \pm 3\) and \(x^{2} = 4 \Rightarrow x = \pm 2\). Now, let’s explore the beauty of equations! Quadratics might look daunting at first, but they open up a realm of possibilities, just like a choose-your-own-adventure book where each pathway leads to unique solutions. Ever wondered about the practical applications of these equations? Well, they're not just numbers on a page! Engineers and architects rely on quadratic formulas every day to design stable structures and predict how forces will act on different materials, ensuring our buildings and bridges can withstand the tests of time and nature.