Quadratic Minimum Value

Problem

For f(x) = a x^2 + b x + c with a > 0, the minimizer is x* = -b / (2a) and the minimum value is c - b^2 / (4a).

Given a, b, and c, return the minimum value.

Hint

Complete the square or substitute the vertex into f.

case 1

in: [1,2,3]

expected: 2

case 2

in: [2,-4,1]

expected: -1

case 3

in: [0.5,1,0]

expected: -0.5

Starter codePython

def quadratic_minimum_value(a, b, c):
    # Your code here
    pass

3 test cases · run your code against them in the editor