Solve by completing the square: .
We have: .
Factor: n .
Then: . . .
n . . . . . .
n . . . . . .
Hi I'm Harvey in London and I'm back at college after almost two decades of no academic studies and have my 1st assignment due in a week. I've managed to get all the questions answered but have been struggling with a particular on completing the square to solver a quadratic and have two issues with it:
Firstly I keep getting surd form answers for my x values, is this ok if I am to sketch the curve for it???
Secondly, that's if it's not ok, then can someone please tell me where I'm going wrong.
I have attached the question and my method of solving in a word doc to this message,
Please please can help me out here; I don't know how many hours I spent on this one question already
P.S. as this is an assignment question, obviously, I'm not asking for the answers just help with methodology
I opened the document, and it appears you want to solve by completing the square:
There are two methods I know of to do this. The first is the method I was taught in school:
The second method I picked up on another forum:
Multiply through by
Add to both sides:
Thanks ever so much guys, you're both great people!! It turns out that my problem with the surds wasn't a problem at all and that in order to treat them as intercepts of the parabola on x-axis I just need to convert to decimal forms, duh. Thanks a lot for caring enough to post a reply and it's brilliant to have another way of completing the square, I shall show that to my maths teacher.