Question

if 81 y2-k=(9y+1/2)(9y-1/2),then the value of k is​

Answer 1

81y²-k

= (9y)²- ( √k)²

( 9y+√k) ( 9y-√k)= (9y+1/2) ( 9y-1/2)..............given

comparing ,

√k= 1/2

thus k = 1/4