Question

A Diver is at sea level. He goes down by 54 m and then swims up by 24 m.If he repeats this 5 times what is the depth of the Diver from sea level?​

Answer 1

Answer:

If -5+iα, -5+iβ (where α²≠β²; α, β∈ R and i²=-1) are roots of x³ + 15x² + c x + 860 = 0, c∈R, Then

(A) c=222

(B) all three roots are imaginary

(C) two roots are imaginary but not complex conjugate of each other

(D) -5+7i√3, -5-7i√3 are imaginary roots

Please give the solution with explanation