Because that formula is a root of the equation we know that ax^2+bx+c=0 So ax^2=-bx-c So a=(-bx-c)/x^2
Hi guys, I've been tasked with rearranging the quadratic root formula to make "a" the subject. I've been struggling on this one for a little while now and can't figure out how to isolate a. For reference, the equation i'm referring to is the addition half of the formula, i.e.
x = (-b + sqroot(b^2 - 4ac))/2a
Any help is much appreciated.
biffboy has an excellent solution.
I'll "do" the algebra.
I've been tasked with rearranging the quadratic root formula to make the subject.
We have: .
. . .
And we have two equations to solve.
biffboy started here!