Question: How to convert the answer to radical term?

I'm having a problem to convert my answer to radical term. I've use 'convert' command' but Maple doesn't work. Thank you for your help. >solve({a1^2*alpha+a2^2*beta=a1, 2*a1*a2*alpha+a2^2*gamma=a2, a1*b1*alpha+a2*b2*beta=b1, a1*b2*alpha+a2*b1*alpha+a2*b2*gamma=b2, b1^2*alpha+b2^2*beta=a1+b1, 2*b1*b2*alpha+b2^2*gamma=a2+b2, a1*b2<>b1*a2},{a1,a2,b1,b2}); >convert(%,radical);
Please Wait...