functions and vectors

Hello,

i am using mathcad 15. i am not sure why M1(x) and M2(x) yield different results. the term shaded blue is the same in both functions. The second term shaded green, in M2(x) , i just simplified more than the one in M1(x) . So i was expecting to see the same results for M1 and M2. But i am not sure what i am doing wrong. Thank you!