Question

If 3x-5y=4 and xy= -7 find 27x^3 - 125y^3​

Answer 1

Answer:

here, 3x-5y=4

xy= -7

27x^3-125y^3

=(3x)^3-(5y)^3

=(3x-5y)^3+3.3x.5y(3x-5y)

=(4)^3+45xy(4)

=64+180.(-7)

=64-1260

= -1196