Topic: MATLAB 101
Can someone help me with MATLAB ? I have 0.05% idea how this thing works. I'm just following instructions from the internet, but I'm still stuck with the problem below. Please anyone, teach me.

- anonymous

- chestercat

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- anonymous

I already done with letter a. I used inline function on this question.
I have no idea how to do letter b. Can anyone help me out?

##### 1 Attachment

- mathmate

What have you learned so far?
Quadratic formula, Newton's method, fixed point iteration, Newton's for systems, or all of the above?

- anonymous

only quadratic formula i think :/
never heard of the other ones..

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## More answers

- mathmate

Is this a course on Matlab only, or it's a course on numerical methods/analysis using Matlab as a tool?

- anonymous

only matlab only

- anonymous

we are only focusing on the commands and stuff

- mathmate

Ok, then there's no expected method to solve the second.
For starters, here's an implicit plot of the system (second problem).
http://prntscr.com/8o3mfh

- mathmate

See if you can reproduce the same plot in Matlab (if you have covered graphics).

- mathmate

The solution near (2,3) is the top right intersection.

- anonymous

we are on the equations right now.. and
i got 2.4072 and 1.1106

- anonymous

if i'll use [2,3]

- mathmate

So you're in a class? I think you should pay attention to what the instructor is showing you instead!

- anonymous

no i have a vacant right now. This assignment is due on wednesday

- mathmate

(2.4,1.1) is definitely not the solution!

- anonymous

so my code is wrong >.<

- mathmate

Have you examined the graph and be convinced that (2.4, 1.1) is not the answer?

- mathmate

You can find out if you put your solution into the equations and see if f(x,y)=0, and g(x,y)=0.

- mathmate

Your solution works for g(x,y)=0 only. f(x,y) gives -36.0

- mathmate

So what method of solution of polynomial equations have you learned so far?

- mathmate

Not sure if you have included both equations into the 'eqns' parameter of fsolve.
That may be your only problem.

- anonymous

oh yeah i made x= x(1) and y=x(2)

- mathmate

You have missed out the 0 at the end of definition of F(1), which makes the constant 4 instead of 40. That's why when substituted you will get -36!
I think that's all you have to correct!

- anonymous

oh so now i get 2.696 and 3.3655 ?

- mathmate

I get 2.6963 and 3.3655 using just display(x).

- anonymous

yes! so those are right?

- mathmate

Absolutely.
If you need more digits, use a more elaborate version of print.

- anonymous

ahh okay. thank you so much!
finally, i can move on with the other exercise xD

- mathmate

Good! You're welcome! :)

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