book Maths Puzzle Numerical Ability

if x=3 and x=-5, then form a quadratic equation. How can I do this to come out right? Thanks

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book Other Question

x - x + 3y - 7g = I do not understand input-output tables. The directions say " Make an input-output table for the function. Use 0,1,2,and 3 as the domain" The first question says "y=3x+2" Please he