Book Maths Puzzle Algebra

factorize 3t^2-27

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Could you please tell me how to do these types of questions...
7x^2+9x+2
They are called "Algebraic Factorisation" Could you give me an example perhaps it is for yoar 10 mathematics. If Lynn can type a page in p minutes, what piece of the page can she do in 5 minutes?