The sum and the product of two numbers are 12 and 20 respectively, the difference of the number is?	Choose one:  A) 1  B) 6  C) 7  D) 8  E) 2
Explanation:   x + y = 12   xy = 20   (x- y)2 = (x + y)2 - 4xy   (x- y)2 = 144 - 80 =&gt; (x - y) = 8   Answer: 8
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The sum and the product of two numbers are 12 and 20 respectively, the difference of the number is?