exam Maths Puzzle Numerical Ability

Please can you help me in this question because am having alot of problem...
there it says complete the table of values for y=x-2-4x

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exam Other Question

4a+3-a=-7+2+a.....The directions say to simplify these type of equations...and i am not sure how to solve them...Could you please help me? One exact x-intercept of y= x^2+kx+1 is 3+2root2.What is the value of k ?