lmarti0181 lmarti0181
  • 23-06-2017
  • Mathematics
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what number must you add to complete the square x^2+2x=13

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irspow
irspow irspow
  • 23-06-2017
You must halve the linear coefficient and then square it.   In this case:

(2/2)^2=1 so you must add 1 to both sides of the equation...

x^2+2x+1=14 now the left side is a perfect square...

(x+1)^2=14
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