Suppose you find seven equally useful articles related to the topic of your research paper. in how many ways can you choose five articles to read?

1st) You can read the 1st article in 7 ways
2d) You can read the 2nd article in 6 ways (because 1 is already chosen)
3rd) You can read the 3rd article in 5 ways (because 2 are already chosen)
4th) You can read the 4th article in 4ways (because 3 are already chosen)
5th) You can read the 5th article in 3 ways (because 4 are already chosen)
Total ways = 7x6x5x4x3 = 2520 ways

You can also find te solution in using the permutation formula

₇P₅ = (7!)/[(7-5)!] = 2520 ways

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 *_*