To find the difference; subtract the coefficients of x², x and constants respectively.

Coefficient of x² in:

1^st expression is i

2^nd expression is 4

Add the x² coefficients. i.e., (i + 4)

Coefficient of x in:

1^st   expression is

2^nd expression is

Add the x coefficients. i.e.,

Coefficient of Constants in:

1^st   expression is 2

1^st   expression is 

Add constants. i.e.,

The solution is .