Question

For the equation y = -2 exp(3 - x) - 4 write a program to solve for the first positive root. Describe the error in your solution.

Answer 1

/* This program is written in c++ for the equation y=-2exp(3-x)-4*

#include<iostream.h>
#include<conio.h>
#include<math.h>
void main()
{
//y=-2exp(3-x)-4
clrscr();
double x,y;
cout<<"enter the value of x";
cin>>x;
y= 2*exp(3-x)-4;
cout<<"The value of y is %f"<<y;
getch();
}

For the different values of x, y returns only negative value because for all positive values of x, y values falls in third quadrent of graphes where all values of y will be negative always.

For all negative values of x, It also returns the negative value.

This equation graph is:-->

x: -2.91666667 y: -746.344816 10 -8 6 -2 2 4 681012 20000 -40000 60000 80000