How to write any subtraction problem as an addition number why does it to write a subtraction problem as an addition problem

Subtracting a positive is the same thing as adding a negative. Subtracting a negative is the same as adding a positive. Sometimes it's a little easier to do it that way.

Answer to your question: a. the fundamental theorem of algebra tells you that the equation will have two complex roots since the degree of the polynomial is 2. the roots are ​ x=1±i7√2 .number of roots=degree of polynomialhere, degree of polynomial is 2 so number of roots will be 2.hope it *_*