Question

If x-y=5 and xy=84,find the value of x^3-y^3

Answer 1

X=12, y= 7
than,
x³-y³= 12³-7³=1728-343= 1385

Answer 2

x-y=5
xy=84
x^3-y^3=(x-y)^3+3xy(x-y)=5^3+3×84=125+252=377