Question

what is the conjugate of x+2+5i?
is it x-2-5i or x+2-5i? im not sure

Answer 1

if x is real its (x+2) - 5i
if x is purely imaginary its 2 - (x+5i)

i thnk x must e a real value there for the answer u need is the 1st one

Answer 2

im trying to solve this problem: Write a polynomial function of minimum degree with real coefficients whose zeros include those listed. Write the polynomial in standard form.

4, -8, and 2 + 5i



and i thought u right everything out by the conjugates like (x-4) (x+8) (x+2+5i) and then i needed the conjugate of 2+5i so that i had the forth zero.

Answer 3

(x-4)(x+8)(x-2-5i) isnt this wht u need?

Answer 4

yes but when you're dealing with imaginary zeros the conjugate will always be a zero as well, like 2+5i is a zero but 2-5i is also a zero