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Instructions
What will come in place of the question mark (?) in each of the following questions ?
Solution
Expression : $$7^{2}\times3^{2}=?^{2}-135$$
=> $$49 \times 9 = (x)^2 - 135$$
=> $$441 = (x)^2 - 135$$
=> $$(x)^2 = 441 + 135 = 576$$
=> $$x = \sqrt{576} = 24$$
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