Question

plese solve this.............​

Answer 1

Answer:

f (x) = x + 722 - 2 +16

f(1+ 2i)

0.1KB/s O

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(1+ 2i)3 + 7(1 + 2i)? – (1+ 2i) + 16

= [1+8* + 6i (1+ 2)] + 7[1+ 4 + 4i] -1

21 + 16

= [1 - 8i +6i – 12] + 7 (1 - 4+ 4i] - 2i + 15

= [-11 21] + 7 [4i 3] 2i + 15

=-11-2i+28i - 21 - 2i + 15

= (-32 + 15) + 24i

=-17 + 24i

Answer 2

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