Disciplined convex programming error

1

Hi friends,
My problem is convex , however, I can not write it in a way defined for CVX, Can any one help me, My cost function is :

-1/2SIGMA(k=1:N)[log((a+(b+c)/2x_k^2)/sqrt((a+bx_k^2)(a+cx_k^2)))]

Thanks in advance:)

2

I will take your word for it that it is convex, but I seriously doubt that it can be represented in CVX.