Question

if 2 X + 3 Y is equal to 8 and x y equal to 2 find the value of 8 x cube + 27 y cub

Answer 1

8x cube+27y cube can be written as:
(2x)cube+(3y)cube=(2x+3y)-3xy(2x+3y)———(1)
put the given values in equation (1):
=8-3(2)(8)
=8-6(8)
=8-48
=40