Instructions

What will come in place of the question mark(?) in the following questions ?

Question 81

$$18^{2}+\sqrt{?}=350$$

Solution

Let the number to replace the question mark be equal to $$X$$

So, $$18^{2}+\sqrt{X}=350$$
So, $$324 + \sqrt{X} = 350$$
Or, $$\sqrt{X} = 350-324 = 26$$

Hence, $$X = 26^2 = 676$$

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