PROGRAMMING:Finding the root of quadratic function of one variable

This is a programming problem template. Please write the title description here. For example: this topic requires reading in 2 integers a and B, and then output their sum.
###Input format:
Please write the input format here. For example: find the root of the quadratic equation AX2 + BX + C = 0. a. The values of B and C are entered by the keyboard during operation
###Output format:
Please describe the output format here. For example, for each set of inputs, output the values of root X1 and root x2 in one row.
###Input example:
Here is a set of inputs. For example:
```in
1 5 4
```
###Output example:
The corresponding output is given here. For example:
```out
x1=-1
x2=-4
```







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