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What is the position of √16 on the number line?

Answer and explanation

Correct answer: 4

The governing concept is the principal square root. The symbol √16 represents the nonnegative number whose square is 16. Since 4^2=4×4=16, √16=4, so the corresponding point on the number line is 4 and option A is correct. A common distinction is needed here: the equation x^2=16 has two solutions, x=4 and x=-4, but the radical symbol √16 denotes only the principal, nonnegative square root. Thus -4 is not the value of √16. Option B is impossible because 8^2=64, and option C is incorrect because 16^2=256. The number 4 is therefore the unique value represented by the radical and the unique correct point among the choices.

Related tags

Square RootPerfect SquareNumber LinePrincipal RootReal NumbersRepresenting Real Numbers On The Number LinePolynomialsMathematics

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