Cos(−θ)=− 2 √ 5 , sinθ>0

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 *_*

5: 20 dividió por 4 en ambos lados1: 4