# Quadratic equation in Wolfram Mathematica

Example for versions
Wolfram Mathematica 8.0.4

After accepting user input we define variable `y`

which is a quadratic equation with the given coefficients. Since `x`

is not defined yet, it stays a variable — for example, `Print[y]`

will output the notation of the equation `c + b x + a x^2`

(with c, b and a replaced with values entered by the user). `Reduce`

calculates the values of the variables which satisfy the condition “equation value equals zero”.

```
a = Input["Input a", 0];
b = Input["Input b", 0];
c = Input["Input c", 0];
y = a*x^2 + b*x + c;
Print[Reduce[y == 0]];
```

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