exam Maths Puzzle Numerical Ability

f(x)=x^2-4x+3.
what is the domain and range?
determine if it is odd,even or neither.

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Could you please help me with this problem:
(3-5i)-(2-7i) Write the expression in the form a+bi, where a and b are real numbers. Thank you! 1/2 + (2/3 divide 3/4) - (4/5 x 5/6)=