exam Maths Puzzle Numerical Ability

Please help me. Using the AC method, please show me the steps to solve this problem.

10m^2-23m-12

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exam Other Question

find the length of x

its a triangle
right side is 51 ft left side is x and bottom is 45 ft
Let f (x)=|x-4| and g(x)+ 2.Find f o g and g o f

Thank you for help