book Maths Puzzle Numerical Ability

Complete the follow equation. Your answers will be algebraic expressions. (a+bi)^2= ??? + ??? i

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book Other Question

25x^2+80X+64=0 All of the sections on a circular spinner with 5 equal sections. If the spinner is spun 3 times, what is the probability that an even number is spun all 3 times?