Question

Derive the quadratic formula for the complete square

Answer 1

Answer:

Completing the square for quadratic equation

algebra-precalculus

I'm learning algebra (at age 66) with home schooling materials. I am doing well and enjoying it. My question is this: The material says I can use "Completing the square" to solve any quadratic equation. I solved this equation

6x2+24x=0

by factoring (got answers 0 and −4). But when I try and solve the same equation by completing the square I get a different answer (±12). I must be doing something wrong but can't figure it out as I think I'm using the right steps to complete the square. Any help appreciated