book Maths Puzzle Numerical Ability

solve system using elimination x + 2y = 7 3x - 2y = -3

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17i divided by (4-1) = 17i over 4-i This I understand - partially anyway...but I am being told that my answer must be in the A + Bi form...this I do not understand solve log base 2 of quantity x + 1 minus log base 4 of x equals 1

log2 of (x+1) minus log4 of x = 1