book Maths Puzzle Numerical Ability

5_6_7=121 Please help I can't solve this equation.

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What is i83= Thank you. I need before 12:00 and could explain why the pattern of imaginary numbers repeat themselves? It would really help me on my test tommorrow!!!!!!!!!!!!1 complete the follwing equation "i" is an imaginary number using algebraic expressions.
(a+bi)(a-bi)=
(a+bi)^2-(a-bi)^2=