Question

Find the value of x cube - y cube, if x-y=7 and xy=-10

Answer 1

Answer:

(x-y) ^2 = x^3 - y^3 - 3xy(x-y)

49 = same as it is -3×-10(7)

49-30×7=x^3-y^3

49-210=same

-161

is the answer.