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f(x) = x4 - 3x3 + 8x2 + 13x + 40
correct

can you kinda go back words with me work best that way please and thanks

ok lets start at the very beginning

if \(-1+2i\) is a zero, then so is its conjugate \(-1-2i\)

the quadratic equation that will have those two zeros is
\[x^2+2x+5\]
is it clear how i got that?

rightt i got that

oh ok good
then your final job is to multiply out
\[(x-4)(x+2)(x^2+2x+5)\]

f(x) = x4 - 7x2 - 26x - 40

thankkkksss

yw, it looks like you did it on your own
good job