Question

How can (1 - x / (x + blah))²⁰ be simplified for Maximum Likelihood Estimations (MLEs)?
a) (1 - 1 / (x + blah))²⁰
b) (1 - 20 / (x + blah))²⁰
c) (1 - 20x / (x + blah))²⁰
d) (1 - 20 / (20x + blah))²⁰