Wilson Colon
02/15/2023 · Senior High School
Solve the equation. \( x^{4}-4 x^{2}-21=0 \) The solution set is \( \{-\sqrt{7}, \sqrt{7}\} \) (Simplify your answer. Use com \( \begin{array}{l}\text { The given equation is quadratic in form. Rewrite the eq } \\ \text { where a } \neq 0 \text { and } u \text { is some algebraic expression. Solve } \\ \text { equation for } u \text {. Then give the solution in terms of the or } \\ \text { Remember, you can check your answer by replacing th } \\ \text { equation with each proposed solution and verifying that }\end{array} \)
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The solutions are \(x=-\sqrt{7}\) and \(x=\sqrt{7}\).
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