plese solve this.............
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Answer:
x³+7x²-x+16
put x= 1+2i
(1+2i)³+7(1+2i)²-(1+2i)+16
(1+2i)(1+2i)²+7(1+2i)²-(1+2i)+16
(1+2i)[(1+2i)²+7(1+2i)-1]+16
(1+2i)[(1+4i²+4i)+7+14i-1]+16
(1+2i)[1-4+4i+7+14i-1]+16
(1+2i)[18i+3]+16
18i+3+36i²+6i+16
24i+3-36+16
-17+24i ANSWER