How to return output argument in matlab?

I created a function to calculate a linear system with 5 unknowns (A1 to A5), which has as output argument 'Ai' and input 'A and b' which are respectively a Matrix and Vector. The values of A and b are assigned, but I did not put it here.

At the end of the function I get the values of Ai (which are 5). But I need to use the Ai values outside of my function!

FOLLOW THE FUNCTION:

function Ai = gauss(A,b)

%% dimensao da matriz. linha, coluna

[l,c]=size(A); 

%% eliminação

for i=1:l-1

for j=i+1:l;

%% definição da constante para zerar as linhas

constante=A(j,i)/A(i,i); 

for k=i+1:l;

%% operação linear para eliminar as linhas

A(j,k)=A(j,k)-constante*A(i,k); 

end

A(j,i)=0;

b(j)=b(j)-constante*b(i);

end

end  

%% Resolução do sistema

%% função Ai recebe um array de zeros

Ai=zeros(l,1);

fprintf('SOLUÇÃO DO SISTEMA:\n\n');

for i=l:-1:1;

    soma=0;

    for k=i+1:l;

        soma=soma+A(i,k)*Ai(k);

    end

    Ai(i)=(b(i)-soma)/A(i,i);

end

end

y=x^2+x;

I want to multiply each value of Ai (which is 5) by the expression below that is outside the gauss function.

y=x^2+x;

But how to use the values of Ai out of function?