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Which points are 4 units away from −2 on the number line?

Answer and explanation

Correct answer: −6 and 2

The governing concept is absolute distance on a number line. A point x is 4 units away from −2 when the distance between x and −2 is 4, represented by |x − (−2)| = 4, or |x + 2| = 4. An absolute-value equation has two cases: x + 2 = 4, which gives x = 2, and x + 2 = −4, which gives x = −6. Therefore, the two points are −6 and 2: one is four units to the left of −2 and the other is four units to its right. Option B gives distances 2 and 6, option C includes the original point −2, and option D gives distances 2 and 8. Hence option A is correct.

Related tags

DistanceNumber-LineAbsolute-ValueNegative-NumbersRepresenting Real Numbers On The Number LinePolynomialsMathematicsClass 10 Mcq

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