Thread: collect2: ld returned 1 exit status error??

I have a pretty simple program, it just asks the user for 3 values and then those are put into the quadratic formula (only using the -b + part of it, no -b -), and then it returns it and prints out the answer. However, I'm getting an error when compiling that I've never seen before.

"/tmp/cceIIpYr.o: In function `main':hw9.3A.c.text+0x84): undefined reference to `posQuadraticEquation'
collect2: ld returned 1 exit status"

hw9.3A.c is the name of the program. I'm compiling with this command:
gcc -o hw9.3A hw9.3A.c -lm

Here is the code:

Code:

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


double posQuadracticEquation(int a, int b, int c);


int main()
{
        int a;
        int b;
        int c;


        printf("Please enter an integer for 'a'.\n");
        scanf("%d", &a);


        printf("Please enter an integer for 'b'.\n");
        scanf("%d", &b);


        printf("Please enter an integer for 'c'.\n");
        scanf("%d", &c);


        double answer = posQuadraticEquation(a, b, c);


        printf("With the values you entered, the positive portion of the Quadratic equation comes out to %lf\n", answer);


}


double posQuadracticEquation(int a, int b, int c)
{
double answer;


        answer = -b/(2*a) + sqrt(b*b - 4*a*c) / (2*a);


        return answer;


}

Any ideas?? Thanks!