{"result":{"text":"fraction numerator bold n factorial over denominator bold r factorial left parenthesis bold n minus bold r right parenthesis factorial end fraction fraction numerator negative bold b plus-or-minus square root of bold b to the power of begin bold style 2 end style end exponent minus bold 4 bold ac end root over denominator begin bold style 2 a end style end fraction square root of bold b to the power of begin bold style 2 end style end exponent minus bold 4 bold a bold italic b end root"},"status":"ok"}