Write the smallest program (in characters) that resolves quadratic equations
ax² + bx + c = 0
Given 3 numbers in R comma-delimited on STDIN: a,b,c (a != 0), print on STDOUT the 2 roots in C, one per line.
R stands for real numbers, C for complex numbers.
Input Output 1,0,0 r1=0 also accepted: r1=(-0-sqrt(0))/2 r2=0 1,2,1 r1=-1 also accepted: r1=(-2-sqrt(0))/2 r2=-1 1,1,1 r1=(-1-isqrt(3))/2 also accepted: r1=(-1-sqrt(-3))/2 or r1=-0.5-0.866i r2=(-1+isqrt(3))/2