if x-y=5 and xy=84 ,find the value of x cube - y cube
Answers
Answered by
38
Given Equation is x - y = 5.
On cubing both sides, we get
(x - y)^3 = (5)^3
x^3 - y^3 - 3xy(x - y) = 125
x^3 - y^3 - 3(84)(5) = 125
x^3 - y^3 - 1260 = 125
x^3 - y^3 = 125 + 1260
x^3 - y^3 = 1385.
Hope this helps!
On cubing both sides, we get
(x - y)^3 = (5)^3
x^3 - y^3 - 3xy(x - y) = 125
x^3 - y^3 - 3(84)(5) = 125
x^3 - y^3 - 1260 = 125
x^3 - y^3 = 125 + 1260
x^3 - y^3 = 1385.
Hope this helps!
siddhartharao77:
:-)
Answered by
5
in every case ans be 1385
Attachments:
Similar questions