book Maths Puzzle Numerical Ability

i am very confused on this whole thing!! LoL im in the 8th grade at MSMS and im confused!!help me=)

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book Other Question

I need understand each step involved and I have to solve each of the following quadratic equations by completing the square. Show all necessary steps involved in finding the soluti ONE HALF A NUMBER INCREASED BY SIX IS THE SAME NUMBER DECREASED BY FOUR. WHAT IS THE NUMBER?