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You have to use the distributive property. Using Sage

var('x')
expand((3 + x)/x^2)

the output you get is

1/x + 3/x^2

and using substitute

expand((3 + x)/x^2).substitute(x=2)

you will get

5/4

which is the correct answer.

You have to use the distributive property. Using Sage

var('x')
expand((3 + x)/x^2)

the output you get is

1/x + 3/x^2

and using substitute

expand((3 + x)/x^2).substitute(x=2)

you will get

5/4

which is the correct answer.answer. What you probably meant is