Question

Solve this very urgent

Answer 1

Answer:

81y^2 - k^2             [a^2 - b^2 = (a+b)(a-b)][Formula applied in both cases]

=> (9y)^2 - (k)^2

=> (9y-k)(9y+k)

(9y+1/2)(9y-1/2)

=> 81y^2 - 1/4

Hope it helps