book Maths Puzzle Numerical Ability

I NEED HELP SOLVING THIS:
(4X + 3W^2)(4X - 3X^2)

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book Other Question

A 55-gallon barrel contains a mixture with a concentration of 40%. How much of this mixture must be withdrawn and replaced by 100% concentrate to bring the mixture up to 75% concen how do you find the answer to this problem: What is the least positive integer that is divisible by whole numbers from 1 to 9.