Question

please give the answer to be brainlist

Answer 1

HI Dear ! 

216 x³ + 1/ 125 

6³x³ + 1/5³

(6x)³ + (1/5)³

( 6x -1/5) ( 36x² +1/25 + 12 x/5 ) 

( 6x -1/5 ) { a = 36 , b = 12/5 , c = 1/25 , D = b² - 4 ac 
                   D = 144/25 - 4 x 36 /25
                   D = 0 }

Now, 
two roots are 
-b+√D/2a , -b -√D/2a 

-12/5+ 0/ 2x 36 , -12/5 - 0/ 2 x 36 

-12/360 , -12/360 

and 6x - 1/5 = 0 

x = 1/5 x 6 

x = 1/30 
now 

x = 
-12/360 , -12/360 , 1/30