Question

When deriving the quadratic formula by completing the square, what expression can be added to both sides of the

equation to create a perfect square trinomial?

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Answer 1

it can also be explained as D on edg if you still needed the answer :)

Answer 2

The element you add is
`b^2 / 4a`

Explanation:

The element you add is
`b^2 / 4a`

Remember that

`a x^2 + bx +c \\= a ( x^2 +(b/a)x ) + c`

So, in order to complete the square you add
`(b/2a)^2`

But when you multiply times
`a` you get

`b^2 / 4a`