Question

What code would I use to get the positive root of a quadratic equation?

Answer 1

There are several numerical methods that accomplish this task; try looking into Newton's method.

Answer 2

why not use an if ans to the quadratic eq is positive use it otherwise ignore it?

Answer 3

try it this way
1) function that computes the roots
2) filter out the positive one`s

for the 1st part i remember that`s there a problem set that covers this part using newton`s method check that out...

Answer 4

Do you remember the old quadratic equation from grade school?\[x =\frac{ \pm \sqrt{b ^{2}-4ac}\ }{2a }\]
Because of the plus or minus, two roots will be given. However, it is very important to note that zero, one, or both of the roots could be positive.
If I were to write a program given your specifications, I would create a function that plugs an x into the quadratic formula for a given a, b, and c, and then return the positive roots (if any).
Let me know if you have any more questions!