How do i get rid of error in line 1 after running script

%this is the code

syms x;
y1=2*x^3-x+8;
y2=15*x^2-17*x-4;
disp('At the Intersection both the curve point will be same');

At the Intersection both the curve point will be same

disp('Therefore equating both the curves : 2*x^3-x+8 = 15*x^2-17*x-4 ');

Therefore equating both the curves : 2*x^3-x+8 = 15*x^2-17*x-4 

disp('Equation becomes : 2*x^3-15*x^2+16*x+12 = 0');

Equation becomes : 2*x^3-15*x^2+16*x+12 = 0

p=[2 -15 16 12];
r=roots(p);
x=r;
y=[0 0 0];
y22=[0 0 0];
for i=1:3
    x1=x(i);
    y(i) = 2*x(i)^3-x(i)+8;
    i=i+1;
end
disp('The intersection points are : ');

The intersection points are : 

for j=1:3
    fprintf('(%.2f,%.2f) ',x(j),y(j));
end

(6.00,434.00) (2.00,22.00) (-0.50,8.25) 

%its supposed to output

[Voss]

Seems to run OK. What error do you get after running it?

[James Water Bird]

Error in Q2 (line 1)

[James Water Bird]

syms x;

[Walter Roberson]

perhaps you do not have the Symbolic Toolbox installed or licensed