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the square of a number is 19,what is the number?

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2 Answers

4.36 =(19)^0.5 which is the square root of 19 

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4.36 is only an approximation of the sqrt(19).
Recall that the square root of a number is a number when squared equals the first number. mathematically if b = sqrt(a) then b^2 = a. So what you are looking for is the square root of 19. It turns out that this is an irrational number (a number continues in its decimal places forever) and usually you write only the first few places. Or simply express it as sqrt(19).