If x + y = 3, then what is the value of x 3 + y 3 + 9xy? X+y=3 Wh

| If x + y = 3, then what is the value of x3 + y3 + 9xy?
A. 15
B. 81
C. 27
D. 9
Please scroll down to see the correct answer and solution guide.
Right Answer is: C
SOLUTION
X+y=3
Whole cube on both side
X3 +y3+3xy(x+y)=27
X3 +y3 +3xy(3)=27
X3 +y3 +9xy=27