Question

if x-2y =12 and xy =8 find the value of x^3 - 5y^3​

Answer 1

x=2y+12

xy=8

(2y+12)y=8

2y^2+12y-8=0

y^2+6y-4=0

y=(-6+√36+16)/2.

and.

y=(-6-√36+16)/2

y=(-6+√52)/2=-3+√13

y=(-6-√52)/2=-3-√13

x=8/(-3+√13) and 8/(-3-√13)

by following like this we get........ answer