A program to solve quadratic equation

I want to write a program in c++ to solve quadratic equation
example 2x^2+x-1=0
Okay, good luck!
*hint:
ax^2+bx+c=0 becomes
x = (-b+-sqrt(b^2-4ac))/2a

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float get_x1(float a, float b, float c)
{
    return (-b + sqrt(b*b - 4 * a * c)) / (2 * a);
}
float get_x2(float a, float b, float c)
{
    return (-b - sqrt(b*b - 4 * a * c)) / (2 * a);
}


The rest of the program is up to you.
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