exam Maths Puzzle Numerical Ability

For each of the following, find the vertex by completing the square:
a) y=-3x^2-6x+4
b) y=4x^2-12x-2
c) y=1/3x^2+2x-1
CAn someone please help me ??

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exam Other Question

Subtract.

4x-2x squared +4x to the 3rd power FROM
4x to the 3rd power + x - 3x squared

I have no clue how to complete this problem. Can you please help me? Thank You!! graph each funtion. find any local maxima or minima to the nearest tenth. find the intervals over which the funtion is increasing and decreasing.

19)p(x)=x^3-4x;-8<_x<-8