Question

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

Answer 1

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

Answer 2

Answer:

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

Step-by-step 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

$b^2 / 4a$