Question

solve this plzzzzzzzzzzzzzzzzzzzzz

Answer 1

Step-by-step explanation:

81y^2-k^2 = 9y^2 × -1/2^2

by 3 rd identify

81y^2 = 9y^2

therefore k^2 = -1/2^2

k=-1/2

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Answer 2

Answer:

explanation:

81y2-k2

= (9y)2-(rootk)2

( 9y+vk) ( 9y-vk)= (9y+1/2) ( 9y-1/2).

..given

comparing

k= 1/2

thus

k = 1/4