How do you solve using completing the square method #x^2 + 2x-7=0#?

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Answer 1 · 2016-07-01T05:06:03

#ax^2+bx+c=0#

into

#a(x+d)^2+e=0#

Obtaining #a# is easy. It's the coefficient of the first term.
To solve for d, use this formula:

#d=b/(2a)#

Finally, to solve for e use this formula:

#e=c-b^2/(4a)#