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(Question 3 (a) from the CSSA trial) question was something like find values of x if x is real and (x + i)^4 is imaginary. here's what I did: = x^4 + 4x^3i + 6x^2i^2 + 4xi^3 + i^4 = x^4 - 6x^2 + 1 + i(4x^3 - 4x) -> imaginary, real part = 0 ie x^4 - 6x^2 + 1 = 0 using the quadtratic...