exam Maths Puzzle Numerical Ability

[2c+4.5d]-[-1.5c+1.5d]

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I know there is a help which can be used for solving quadratic equations, but I'm not sure how it works. Can you give that information and explain the process. It's something lik I would like to know how to find out the feasible region of a linear programming equation. I need the answer as soon as possible.