How to write code for solving system of nonlinear inequality

I am very new to matlab and programming in general. I believe I am not using syntax properly to get it to do what I want, or I just don't understand the logic. In any case this is the problem I need help solving in matlab:

y(x)={ 6x^2-5x+14} x>=0

y(x)={9x-3} x>0

range is -10 to 10 in increments of 1.

This is the code I tried. It only shows the x array when I run it and nothing else (no error message). I know it's probably way off but I'm only going off of a few help videos and a programming structure lecture.

x=-10:1:10
for i=1:21
    if x>=0
        y(x)=6*x^2-5*x+14
    elseif x>10
        disp('x out of range')
    end
    if x<0
        y(x)=9*x-3
    elseif x<-10
        disp('x out of range')
    end
end

Answer 1

[Walter Roberson]

x=-10:1:10;
for i=1:length(x)
    if x(i)>=0
        y(i)=6*x(i)^2-5*x(i)+14;
    elseif x(i)>10
        disp('x out of range')
    end
    if x(i)<0
        y(i)=9*x(i)-3;
    elseif x(i)<-10
        disp('x out of range')
    end
end
y

y = 1×21

-93 -84 -75 -66 -57 -48 -39 -30 -21 -12 14 15 28 53 90 139 200 273 358 455 564

[Greg]

That works, thank you!