Instructions

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

Question 154

$$(15)^{2}+(18)^{2}-20=\sqrt{?}$$

Solution

Let the number required be equal to $$X$$

Hence, $$(15)^{2}+(18)^{2}-20=\sqrt{X}$$

225 + 324 -20 = $$\sqrt{X}$$

So, X = $$ 529^2$$ =279841

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