if x + y = 4 and x 2 y 3 + y 2 x 3 = 36 , what is the value of xy ?
"xy = 3 as x + y = 4 x 2 y 3 + y 2 x 3 = 36 x 2 y 2 ( y + x ) = 36 substituting x + y x 2 y 2 = 4 xy = 4 answer : d"
sqrt(divide(4, 4))