If x -y = 5 and xy= 14 find the value of x square- y square??????
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x-y=5
x=5+y
xy=14
y(5+y)=14
5y+y^2-14=0
y^2+7y-2y-14=0
y(y+7)-2(y+7)=0
(y-2)(y+7)=0
y=2,-7
x-(-7)=5 or x-2=5
x=-2,7
now you can find
x^2-y^2
x=5+y
xy=14
y(5+y)=14
5y+y^2-14=0
y^2+7y-2y-14=0
y(y+7)-2(y+7)=0
(y-2)(y+7)=0
y=2,-7
x-(-7)=5 or x-2=5
x=-2,7
now you can find
x^2-y^2
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