Instructions
What should come in place of question mark (?) in the following questions ?
Solution
We need to find the value of $$(21.69)^{2}-\sqrt{324}$$
$$\sqrt{324} = 18$$ and
$$(21.69)^{2} = 470.4561$$
Hence, the required expression equals $$470.4561 - 18 = 452.4561$$
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