Solution
Expression : $$3x^{2} = 10^{2} - 5^{2}$$
=> $$3x^2 = 100 - 25$$
=> $$3x^2 = 75$$
=> $$x^2 = \frac{75}{3} = 25$$
=> $$x = \sqrt{25} = 5$$
=> Ans - (B)
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