if x + y = 3 and x 2 y 3 + y 2 x 3 = 27 , what is the value of xy ?
"xy = 3 as x + y = 3 x 2 y 3 + y 2 x 3 = 27 x 2 y 2 ( y + x ) = 27 substituting x + y x 2 y 2 = 9 xy = 3 answer : c"
sqrt(divide(27, 3))