Let f be a function defined by f:x→5x2 + 2 : x∈R i) Find the image of 3 under f. ii)Find f(3).f(2) iii)Find x such that f(x)=22 Please response to this question...

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Formula to express the given relation. The area A of a parallelogram is the product of the base b and the height h

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I don't remember how to do the question

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I don't remember how to solve this!

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I'm learning relations and functions. How would you solve f(x)=5/(x+2) if f(m-2)? So far I plugged it in and have f(m-2)=5/([m-2]+2) but am confused on how to solve it