If x+y = 3, xy =2 what is the value of x3+y3
2 answers:
Answer:
X+y=3. X=3-y. X=3-y. (1)
X.y=2. Y.(3-y) =2. 3y-y^2=2 (2)
(2). -y^2+3y=2
0=Y^2-3y+2
Y=1. X=3-1. X=2
Y=2. X=3-2. X=1
Step-by-step explanation:
Answer:
- 18
Step-by-step explanation:
As
(x+y)^3=x^3+y^3+3xy(x+y)
By substituting values,
27-18=x^3+y^3
=》x^3+y^3=9
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