Question

Square of the complex number (i - 2)?

Answer 1

$(i-2)^{2} = i^{2} -4i+4 \\ i= \sqrt{-1} \\ i^{2} =-1 \\ i^{2} -4i+4=-1-4i+4=-4i+3\\ answer: 3-4i$

Answer 2

i square+2 square-2x2xi= -1+4-4i=3-4i
(i square=-1)