Question

find k if 81y² - k = (9y - 1/2) (9y + 1/2)​

Answer 1

I hope it will help you

Answer 2

Answer:

k=1/4

Step-by-step explanation:

81y²-k=(9y+1/2)(9y-1/2) (a+b)(a-b)=a²-b²

81y²-k=(9y)²-(1/2)²

81y²-k=81y²-1/4

81y²-81y²-k=-1/4

-k=-1/4

k=1/4

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