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anonymous
 one year ago
Solve x^2 + 10x  11 = 0 by completing the square
Ok, so I need help with this, I have the answer and I know how to do it, I just want to check it.
anonymous
 one year ago
Solve x^2 + 10x  11 = 0 by completing the square Ok, so I need help with this, I have the answer and I know how to do it, I just want to check it.

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campbell_st
 one year ago
Best ResponseYou've already chosen the best response.0ok... to you need to group a few things \[x^2 + 10x = 11\] to complete the square find half of 10 and then square it... that's the value that makes the perfect square then add it to both sides..

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Ok that's a bit different then how I learned it but I think it's pretty much the same thing.. I would do x^2 + 10x + 25=11+25 Then group it to where it's (X+5)^2=36 Then you would put the (x+5)^2 under a radical sign, and the 36 under the radical sign, and you can't forget the plus and minus sign

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0But I don't know what to do after

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.0ok... so when you take the square root there are 2 solutions, the positive and negative so take the square root of both sides \[x + 5 = \pm \sqrt{36} ~~or~~~x + 5 = \pm 6\] now subtract 5 from both sides of the equation and you get \[x = 5 \pm 6\] so you ahve 2 equations x = 5 6 and x = 5 + 6 does that make sense

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Yes, see, I did all that But I had three instead of six. But thank you so much! I'm glad I checked with someone :)
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