Question

if you know that 7 + 2i is a root of a polynomial function ,what is another root of that same function?

Answer 1

7+ sqrt of -2

Answer 2

i think...

Answer 3

its conjugate 7 - 2i

Answer 4

So which is it?

Answer 5

my ans is correct

Answer 6

oh yeah hes right

Answer 7

K..thanks for the help

Answer 8

If you are told that the polynomial has rational coefficients, then any complex roots come in complex conjugate pairs.
Since you are given that 7 + 2i is a root, then its complec conjugate, 7 - 2i, is also a root.