Book Maths Puzzle Algebra

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.

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Book Other Question

a farmer plans to enclose a rectangular pasture adjacent to a river, having an area of 180,000 sq. ft. No fencing is required along the river. What dimension will use the smallest factorize 3t^2-27