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If x=√72 on the number line, what is the correct simplified form of x?

Answer and explanation

Correct answer: 6√2

Answer: A, 6√2. Simplify a square root by taking the largest perfect-square factor outside the radical. Write 72=36×2, where 36 is a perfect square. Then √72=√(36×2)=√36×√2=6√2. The factor 2 cannot be simplified further, so this is the simplest form. Option B is not equal: (8√2)^2=128, not 72. Option C, 3√8, is equivalent in value but not fully simplified, because √8=√(4×2)=2√2 and hence 3√8=6√2. Option D is too large; its square is 288. A useful memory cue is to remove perfect-square factors in pairs: 36 contributes 6 outside and leaves 2 inside. Never take the square root of 72 as 72's approximate value without simplifying the exact radical.

Related tags

Real-NumbersSquare-RootsRadical-SimplificationIrrational-NumbersIrrational Numbers And Real NumbersPolynomialsMathematicsClass 10 Mcq

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