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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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