Question

find the value of x^3 +7x^2-x+16,when x=1+2i

Answer 1

heya yor answer is
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x=1+2i x-1=2i Sqaring both sides (x-1)^2 = (2i)^2 x^2+1-2x = 4i^2 x^2-2x+1+4 =0 x^2-2x+5=0 Now divide x^3+7x^2-x+16 by x^2-2x+5...