Answer 1

#include <iostream>
using namespace std;

int main()
{
int x = 0;
int a = 0, b = 0;

cout << "What is x? "; cin >> x;
a = 5 * x + 10;
b = 3 * x * x + 5;

cout << (a < b ? "5x+10 is min" : "3x^2+5 is min");
}