plus-minus function

How would I do the function

Y=B/2*(1-(4*X.^2)/L^2)*(1-Z.^2/D^2);

but before the B i need a plus and minus sign so the variable Y has all the values for positive and negative

Answer 1

[Honglei Chen]

Hi Sean,

You can do something like

Y=B/2*(1-(4*X.^2)/L^2)*(1-Z.^2/D^2);
Y = [Y -Y];

HTH

Answer 2

[Selvakumar]

X=B−√B2+16A2A