Question

value of x³+7x²-x+16 where x=1+2i
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Answer 1

Answer:

x=1+2i

x−1=2i

(x−1)

2

=4i

2

x

2

−2x+1=−4

x

2

−2x+5=0

Therefore, x

3

+7x

2

−x+16=x(x

2

−2x+5)+9(x

2

−2x+5)+(12x−29)

=x(0)+9(0)+12x−29

=12(1+2i)−29=−17+24i

Answer 2

I don't know if you are send the character then I solve this