If X + Y is equal to 4 and X Y is equal to 5 find the value of x cube + y cube
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Answered by
11
Evening,
x+y=4
xy=5
we know that,
(x+y)^3=x^3+y^3+3xy(x+y)
subs. values above...
(4)^3=x^3+y^3 +3×5×4
64=x^3+y^3+60
therefore. x^3+y^3=4
^_^ ,, comment if any queries and don't forget to mark it the brainliest!
thank you!
x+y=4
xy=5
we know that,
(x+y)^3=x^3+y^3+3xy(x+y)
subs. values above...
(4)^3=x^3+y^3 +3×5×4
64=x^3+y^3+60
therefore. x^3+y^3=4
^_^ ,, comment if any queries and don't forget to mark it the brainliest!
thank you!
Answered by
4
(x+y )³=x ³+y ³+3xy(x+y)
4³=x ³+y ³+3(5*4)
x ³+y ³=64-60
=4
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