Question 76

If $$4x^2 = 15^2 - 9^2$$, then value of x is

Solution

Expression : $$4x^2 = 15^2 - 9^2$$

=> $$4x^2 = (15-9)(15+9)$$

=> $$4x^2 = (6)(24)$$

=> $$x^2 = \frac{6 \times 24}{4} = 36$$

=> $$x = \sqrt{36} = 6$$

=> Ans - (B)

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