Respective Initial Value Solutions for Nonlinear Equations Using Newton's Method

[xiaobai5883]

Homework Statement

Find the zero for the following equation with the respective initial value...
a)cos(x)=(e^x)-1,x0=0
b)ln(x)=x^2-1,x0=1
c)x^2=2x+2,x0=2.6
the answers i get are...
a)0.6931
b)1
c)2.7321
but here comes my question...
i'm attempting a class teach us to use the software matlab...
but 2 out of 3 answers that i get from using the software is different from what i count myself...
the software MATLAB give me the answers are
a)0.6013
b)1
c)error
can someone help me??
please and thank you...

Homework Equations

The Attempt at a Solution

 

[HallsofIvy]

I assume you are using some kind of iterative method to numerically solve these equations- but what method? Secant method? Newton's method?

 

[xiaobai5883]

I assume you are using some kind of iterative method to numerically solve these equations- but what method? Secant method? Newton's method?

i'm using Newton's method...
is that effect the answers??