x+y=17, xy=60, (x-y)=?
Correct Answer: Option A
\[\begin{array}{l}
{(x - y)^2} = {(x + y)^2} - 4xy\\
= > {(x - y)^2} = {17^2} - 4 \times 60\\
= > {(x - y)^2} = 289 - 240\\
= > {(x - y)^2} = 49\\
(x - y) = 7
\end{array}\]
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