Solution
$$2\frac{1}{5}x^{2}=2750$$
==> $$\frac{11}{5}x^{2}=2750$$
==> $$x^{2}= \frac{2750\times5}{11}$$
==> $$x^{2}= 1250$$
==> $$x = \sqrt{1250}=\sqrt{625\times2}$$
==> $$x = 25\sqrt{2}$$
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