exam Maths Puzzle Numerical Ability

Please help me factor the polynomial. Thanks

3a^2-12a+12

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exam Other Question

Im having trouble graphing this one too. I think it is the formula for a parabola but my process must be a little mixed up because it just isnt working out for me at all. I would appreciate any help.
Kyle write the equation of the line passing through each of the given pairs of points. Write your results in slope intercept form where possible.
#20 is: (-1,3) and (4,-2)

#24 is: (2,-3) and (2,4)

Thanks!