Sum and product

The sum of the real numbers x and y is 12. Their difference is 8. What is the value of xy?

Correct answer:

w =  20

Step-by-step explanation:

x+y=12 xy=8  x+y=12 xy=8  Row2Row1Row2 x+y=12 2y=4  y=24=2 x=12y=122=10  x=10 y=2  w=x y=10 2=20

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