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Expression : $$13x^2 = 17^2 - 9^2$$
=> $$13 x^2 = (17 - 9) (17 + 9)$$
=> $$13 x^2 = 8 \times 26$$
=> $$x^2 = 8 \times 2 = 16$$
=> $$x = \sqrt{16} = 4$$
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