please solve it.......
Attachments:
Answers
Answered by
1
Step-by-step explanation:
9y²+1/y²= 3
(3y)²+(1/y)²=3
(3y+1/y)²-2×3y×1/y= 3
(3y+1/y)²-6=3
(3y+1/y)²=9
3y+1/y= 3
27y³+1/y³
= (3y) ³+ (1/y)³
= (3y+1/y)( 9y²-6+1/y²)
= 3(3-6)
= -9
Similar questions