I am getting errors in the polynomial equation x.I hav no idea whats wrong.This equation was provided.My code is as followed

Code:
#include<stdio.h>
#include<stdlib.h>

int main(void)
{
	
	double x;
	double polynomial=3x^3-5x^2+6;     /*This is giving me problem*/
	
	x=2.55;
	printf("The value of polynomial is %lf\n",polynomial);

	system("pause");

	return(EXIT_SUCCESS);
}