Question

f(x)=x2+2x-5

Answer 1

Function:

f(x)=x2+2x-5

Graphics

MATLAB CODE

clc

close all

clear all

x=-10:10;

y=x.^2+2*x-5;

plot(x,y,'--k')

grid on

xlabel('x');

ylabel('y');

legend('y=x.^2+2*x-5');

title('y=x.^2+2*x-5');

[x1, y] = fzero('x.^2+2*x-5', -5)

[x2, y] = fzero('x.^2+2*x-5', 0)

x1 = -3.4495 x2 = 1.4495 is roots