book Maths Puzzle Numerical Ability

i do not understand polynomials AT ALL so any help would greatly be appreciated
(2x squared +3x - 5)+ (7x squared -x+7)=
i tried it and this is what i got for the answer
9xsquar

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I need help. I'm a landscape designer and carpenter. I lost my daily planner which had all the formulas that I use regularly in estimating jobs. I need a quick reference with the f Question:
Find the equation of the following conic section:
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