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If \(\sqrt{x}=3.9\), which point does \(x\) represent on the number line?

Answer and explanation

Correct answer: 15.21

Given \(\sqrt{x}=3.9\), squaring both sides gives \(x=(3.9)^2=3.9\times3.9=15.21\). Hence, \(x\) represents the point 15.21 on the number line. The values 7.8, 12.21, and 3.09 do not result from correctly squaring 3.9. Exam tip: when squaring a decimal, multiply the numbers as whole numbers first and then place the decimal point according to the total number of decimal places.

Related tags

Number LineSquare Root EquationsDecimal MultiplicationReal NumbersRepresenting Real Numbers On The Number LinePolynomialsMathematicsClass 10 Mcq

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