exam Maths Puzzle Numerical Ability

I need help!!! I am suppose to describe a strategy for factoring a polynomial and give example showing all your steps. Can someone help me on this one.

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exam Other Question

If the lines passing through the points (1,a) and (4,-2) is parallel to the line passing through the points (2,8) and (-7,a+4), what is the value of a? -7x- 7=-2