Posted by cole on Tuesday, April 27, 2010 at 9:04pm.
which function below, if either, has zeros that are complex conjugates?
P(x)= X^47x^327x^2+63x+81
H(x)=x^3x^2+25x25

algebra two  Reiny, Tuesday, April 27, 2010 at 9:53pm
H(x) = x^2(x1) + 25(x1)
= (x1)(x^2 + 25)
for zeros,
(x1)(x^2 + 25) = 0
x = 1, or x = ±5i
±5i are complex conjugates
Off hand, I can't see any for the first one.

algebra two  cole, Tuesday, April 27, 2010 at 9:57pm
what do you mean

algebra two  Reiny, Tuesday, April 27, 2010 at 10:59pm
complex conjugates are numbers of the form
a+bi and abi
±5i can be written as
0+5i and 05i, which fits the above form.
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