Find minimum points matlab

Hey,

I need to find minimum points. I wrote this code -

syms x real
f=(x^2)-4*x+9;
d1=diff(f,1);
res=solve(d1==0);
min(vpa(res,4))

and i get the answer - is this correct? and if I want to find the Y, so what I need to do?

ans =
 
2.0

Answer 1

[KSSV]

subs(d1,res)

You will get it as zero.....so the value x = 2 is a root to d1.

Also your d1 = 2*x-4.

On solving manually 2*x-4 = 0, you will get x = 2.

[Noa Yelin]

and if I want to know the Y also, what I need to do?

[KSSV]

Y?? What is Y?

[Noa Yelin]

I need to whole point (2,5)

so I got only x=2, how can I print the 5?

[KSSV]

As your d1 is a linear equation.....you will get only one root.

[Noa Yelin]

Thank you