exam Maths Puzzle Numerical Ability

graph f(x)= -x-2 do I first go like (0,-2) and (-2,0) then graph

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exam Other Question

Factor completely:
a. 4x^2 + 34x +42
b. x^8 - 1 OK I am stuck on how to do this. Can you please explain it.The problem goes like this: Solve and graph the solution set.
a) 5y+3,_< -2 or y-7_>0
b) x-9< 3x-4< x+8
PLEASE HELP