if x -y = 7, x y =9 find x square + y square
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hey your ans is here
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given
x-y=7
xy=9
x2+y2=?
using the identity
(x-y)^2=x2+y2-2xy
(7)2=x2+y2-2(9)
49=x2+y2-18
49+18=x2+y2
67=x2+y2
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hope it helps:-)
------
given
x-y=7
xy=9
x2+y2=?
using the identity
(x-y)^2=x2+y2-2xy
(7)2=x2+y2-2(9)
49=x2+y2-18
49+18=x2+y2
67=x2+y2
-------
hope it helps:-)
usfkhan:
yes
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