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.
Regards,
Sathya
Hello, SSmith!
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: .
Mulitply by
Add
Square: .
. .
.
. . .
And we have two equations to solve.
biffboy started here!