Ex resolvido 17

#include <stdio.h>
#include <stdlib.h>
#include <math.h>

int main(){

    float a = 0.0, b = 0.0, c = 0.0, delta = 0.0, x1 = 0.0, x2 = 0.0;

    printf("Valor de A:\n");
    scanf("%f", &a);
    printf("Valor de B:\n");
    scanf("%f", &b);
    printf("Valor de C:\n");
    scanf("%f", &c);

    if(a == 0){
        printf("A deve ser diferente de 0.\n");
    }else{
        delta = (b * b) - 4 * a *c;

        if(delta < 0){
            printf("Nao ha raizes reais.\n");
        }else if(delta == 0){
            x1 = ((b * -1) + sqrt(delta)) / (2 * a);

            printf("Uma unica raiz. X = %.2f", x1);
        }else{
            x1 = ((b * -1) + sqrt(delta)) / (2 * a);
            x2 = ((b * -1) - sqrt(delta)) / (2 * a);

            printf("Duas raizes. X1 = %.2f, X2 = %.2f", x1, x2);
        }
    }
    return 0;
}