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23-06-2017
Mathematics

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what number must you add to complete the square x^2+2x=13

Respuesta :

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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