How to solve Regular Falsi Iteration Method using MATLAB??

By using the False Position/ Regular Falsi Numerical method to find the positive root of the quadratic equation Correct to 3 significant figures:

f(x)=5x^2+11x-17

[James Tursa]

What have you done so far? What specific problems are you having with your code?

[Ameer Hamza]

clc

% Setting x as symbolic variable

syms x;

% Input Section

y = input('Enter non-linear equations: ');

a = input('Enter first guess: ');

b = input('Enter second guess: ');

e = input('Tolerable error: ');

% Finding Functional Value

fa = eval(subs(y,x,a));

fb = eval(subs(y,x,b));

% Implementing Bisection Method

if fa*fb > 0

disp('Given initial values do not bracket the root.');

else

c = a - (a-b) * fa/(fa-fb);

fc = eval(subs(y,x,c));

As you can see my above coding, however it is showing an error...

Enter non-linear equations: 5*x^2+11*x-17

Enter first guess: 1

Enter second guess: 2

Tolerable error: 0.0001

??? Undefined function or method 'eval' for input arguments of type 'double'.

Error in ==> Untitled4 at 13

fa = eval(subs(y,x,a));

Kindly help me out??