Question

Help please.

Answer 1

Find the value of:-
\[\huge x ^{4}+9x ^{3}+35x ^{2}-x+4\]
If
\[\huge x=-5+\sqrt{-4}\]

Answer 2

substitute

Answer 3

it might be helpful to write \[\large x=-5+\sqrt{-4} = -5+2i\]

Answer 4

Yeah ofcourse , what substitute , there is a nice method

Answer 5

have you thought about factoring before you substitute?

Answer 6

I proceeded like this :-/

(x+5)^2= -4

x^2 +10x + 25 = -4

x^2+10x+29 = 0

and divide it using synthetic division , but i am not getting that , does , anyone know it