book Maths Puzzle Numerical Ability

how do you reduce 2x2+7+3
_______
x+3

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book Other Question

Hi, could you tell me how can I simplify this expression: (1+2i)^(2i).

I know the trick to solve this problem is to recognize the expression as e^(2i*Log(1-i)).
Then it simpl Without drawing a graph how can I determine (a) how many x-intercepts the parabola has (b) whether its vertex is above, below or on the x- axis?

y = -x^2 + 2x-1