exam Maths Puzzle Numerical Ability

how do you know what to put in the reason side of a two colum proof?

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exam Other Question

Provide the class with a third expression to
simplify that includes rational (fractional) exponents.
If f(x)=a(x-2)2 +3, is the function whose graph contains the point (4,9), find a. I answered 4/9. Is that correct? Please work so I can see. Thanks