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If $X = {x : x^{2} - 12 x + 20 = 0}$ and $Y = {x : x^{2} + 5 x - 14 = 0}$ , then $X - Y =$

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$\{1\}$

${10}$

${2}$

${- 7}$

answer is B.

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Detailed Solution

$X = {x / x^{2} - 12 x + 20} = {2, 10}$

$Y = {x / x^{2} + 5 x - 14 = 0} = {2, - 7}$

$X - Y = {2, 10} - {2, - 7}$

$= {10}$

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