MATLAB

i have created user defined function called HW05roots that calculated roots of equation

for example roots of x^2 + 5x + 6 =0 are r1 = -2 and r2 = -3

im looking to write if statement that displays no postive roots for this quadratic equation if both or one roots is negative, else if postive it displays the postive root or roots

thanks

clear HW05roots (a,b, c) disp ('No postive roots for this quadratic equation) else en