Question

Help!

Answer 1

Construct a cubic polynomial with real coefficients, one of whose zeros is 6 + i, and passing through the point (-1,20).

Answer 2

since 6+i is a root, then so must 6-i be a root also (complex roots come in conjugate pairs...)

Answer 3

it means when x=-1, y=20....

Answer 4

you need an equation of the form y=(x-k)(x-6-i)(x-6+i), multiply this out, replace x, y with -1 and 20 and solve for k.

Answer 5

k= -7/5?