$$u^2 = 49$$
Answer
$$ \begin{matrix}u_1 = 7 & u_2 = -7 \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} u^2 &= 49&& \text{move all terms to the left hand side } \\[1 em]u^2-49 &= 0&& \\[1 em] \end{aligned} $$
$ x^{2}-49 = 0 $ is a quadratic equation.
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