please write the code in c not c++

EEL 2161 Exam. 1. Create a script that will find the roots of quadratic equations "x3-7.2x1+16.65x-12.125-0 by using continuously changing the value of x within a certain range (IE:-100-r=10.) Use "for" or while loop. Also, when you display the answers, make the result displayed from the largest to the smallest