The quadratic formula is
2a on the bottom NOT 2c.
I'm getting a little confused with the quadrativ formula, i used to know it, but its been a while!
i'm getting -b+/- square root (b-4ac) / 2* c
the part im getting confused on is the 2 * c, what if my original equation was x^2 - 10x - 3 (where -3 would be c)
do i add the minus sign into the equation which would give me 2 * -3 = -6 and then divide the whole equation by -6 or do i forget the minus sign and change it to positive 6?
Hello
You're asking two things here: the first is about the formula itself, and the second is how to handle minus signs. So:
1 The formula you want is
2 Handling minus signs. Remember the rules for multiplying and dividing positive ( ) and negative ( ) numbers:
So, do you just forget the minus signs and change them to positive? Definitely not!
Taking your example:
gives , and
Plugging these values into the formula, you get:
(Where I've written two numbers in brackets next to one another - like , there's a sign in between; so that means .)
So
Can you see where all the minus signs have gone, using the rules above?
I hope that helps to clear one or two problems up.
Grandad