exam Maths Puzzle Numerical Ability

Simplify ((9x^4-72X)/(3x^2-12))*((x^2+x-2)/(4x^3+8x^2+16x))

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Hello, I am hoping for some help on this problem I am working on, here is the problem: Evaluate each of the expressions if a=-2, b=5, c=-4, and d=6. Now the question; b^ - 2bc + c^ How many liters of water must be added to 8 liters of a 40% acid solution to obtain a 10% acid solution