Question

X+Y=8 and xy=15 find x^3-y^3

Answer 1

Answer:

98 or -98

Step-by-step explanation:

x+y=8. XY=15

x+15/y=8 y=15/x

x^2+15=8x. y=15/3. y=15/5

x^2-8x+15=0 y=+5,+3

(x-5) (x-3)=0

x=+5,+3

NOW

X^3-Y^3

1ST. 2ND

5^3-3^3. 3^3-5^5

98. -98