After john worked at a job for 10 years, his salary doubled. if he started at $ x , his salary after 10 years is

$ x
$ x + 2
$ x - 2
$2 x

Since it doubled it's twice(2) the amount he started with. $2x

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 *_*