Question

.
2x+y = 6
xy = 4
8x^3+y^3 = ?​

Answer 1

Answer:y

( 12 x 2 − 6 x y + y 2 )  

Explanation:

this is a  

difference of cubes

which factors in general as

 x a 3 − b 3 = ( a − b ) ( a 2 + a b + b 2 )

8 x 3 = 2 x ) 3 ⇒ a = 2 x  and  b = 2 x − y  = ( 2 x − ( 2 x − y ) ) ( ( 2 x 2 + 2 x ( 2 x − y ) +   ( 2 X− y ) 2)

= y 4 x 2 + 4 x 2 − 2 x y + 4 x 2 − 4 x y + y 2 )  = y ( 12 x 2 -6 x y + 2 )

Answer 2

Step-by-step explanation:

so open the picture above and have a nice day