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 \sqrt{(k+9) ^{2} } =  \sqrt{289}

First thing you need to do is put the square root symbol/radical symbol (

0 0 0
Then extract by removing the exponent and finding the square root:
k+9= Positive or Negative 17
Move the constant
k=17-9 and k=-17-9
k=8 and k=-26 that's the answer
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