pythonmathalgebra
How to write (+/-) in Python?
I'm new to Python and I have below this formula and I faced (+/-) before the square root. How could I write it in Python?
Solution
One way or another, you'll have to build two expressions, one with the plus sign and the other with the minus sign. This is the most straightforward way:
from math import sqrt
x1 = (-b + sqrt(b*b - 4*a*c)) / 2.0
x2 = (-b - sqrt(b*b - 4*a*c)) / 2.0
Of course you should calculate the value of b*b - 4*a*c only once and store it in a variable, and check if it's negative before proceeding (to avoid an error when trying to take the square root of a negative number), but those details are left as an exercise for the reader.
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