Mathematics, 07.08.2019 12:10 jonmorton159
Let x and y be real numbers satisfying two conditions: x-y=5 and xy=7. find x^3y+xy^3
Answers: 1
![x^3y+xy^3 = xy(x^2+y^2) = xy[(x-y)^2+2xy]](/tpl/images/0172/6969/d7eeb.png)
![xy[(x-y)^2+2xy]=7\cdot(5^2+2\cdot 7) = 7\cdot (25-7) = 7\cdot 18 = 126](/tpl/images/0172/6969/29e3e.png)
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Let x and y be real numbers satisfying two conditions: x-y=5 and xy=7. find x^3y+xy^3...
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