Question 78

If $$3x^{2} = 10^{2} - 5^{2}$$, find the value of x?

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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