Jazmin D.

asked • 09/14/14

how do you solve equation by extracting square root? 2(x-5)^2=17

2(x-5)^2=17 How do I solve this using extraction of square roots? HELP!!

3 Answers By Expert Tutors

By:

Phillip R.

when you take square root you should get + and - √(17/2)
The quadratic should have two solutions
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09/14/14

Phillip R.

For equations such as this, we write the answer in radical form for the exact reason you state that rounding off creates an inaccurate answer. You can see my answer that I posted about an hour before. Suggesting rounding to the ten thousandth place or any other estimate is not recommended. 
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09/14/14

Lisa K.

tutor
Hi Phillip. I understand that and completely agree, but it also depends on what the assignment calls for. I went on the assumption that the answer should be solved and written as a decimal because of what I have seen many times in similar assignments. But at least she has both options to choose from. :)
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09/14/14

Phillip R. answered • 09/14/14

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Jazmin D.

I just want to make sure I get the concept . so if I have 4(u+1)^2=18 my answer would be u=-1±√(9/2)?
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09/14/14

Phillip R.

Yes you are exactly correct. Good job. 
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09/14/14

Jazmin D.

Thank you so much! 
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09/14/14

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