2-4

#include <iostream.h>

int main()
{
	float x;
	float y;
	cout << "yek adad vaared konid:";
	cin >> x;
	// mo'aadeleye navasaan
	y = 5*(x*x*x) + 4*x - 7;
	cout << "5x^3 + 4x - 7 ="
		<< y << "\n";
	return 0;
}