book Maths Puzzle Numerical Ability

Can you help me factor the polynomial 8a^3b+12a^2b^2-4a^2b

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book Other Question

Graph the solution of the system of linear inequalities
2x+y>or equal to 4
x-1>0 If a parabola goes through points (-1,3), (2,7), (4,-3), what is its vertex.

I am lost on this one. I thought I had it but I can not find it.
Thanks for your help
-Ryan