Question

if x=-5+✓-16,find the value of (x×x×x×x)+9(x×x×x)+35(x×x)-x+4​

Answer 1

$\huge \mathscr{\orange {\underline{\pink{\underline {Answer:-}}}}}$

x=-5+4i

x²=(-5+4i).(-5+4i)=9–40i

x³=(9–40i).(-5+4i)=115+236i

x⁴=(115+236i).(-5+4i)=-1519–720i

Therefore,

x⁴+9x³+35x²-x+4=-1519–720i+9(115+236i)+35(9–40i)-(-5+4i)+4

=(-1519+1035+315+5+4)+(-720+2124–1400–4)i

=-160