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:

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

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