Since we know that squares have the same length on all sides, you would find the square root of 170
√170=13.03840481
rounded to the nearest tenth would be 13.1
You can check your work by multiplying 13.1 by 13.1 which equals 170.3
I try to explain the problem and give the answer, I hope this helps!
The answer to this question is 5a^2-6a+20+(-175a+102)over(5a^2+6a-9)
Estimation would give you an answer close to the actual answer so you can see if your answer is reasonable depending on how close the estimate is
