exam Maths Puzzle Numerical Ability

Given that (3x-a)(x-2)(x-7)=3x^3-32x^2+81x-70, determine the value of a...

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I don't understand how to solve this problem dealing with absolute value and real numbers.

-|3-9|+2|-5-6|=_____

2|-4-9|-4|2+(9)|=_____

Thank you Find the LCM.

4m^2-64 and 6m^2-18m-24

A. 24(m � 4)(m + 4)(m + 1)
B. 12m(m � 4)(m + 4)(m + 1)
C. 12(m � 4)(m + 4)(m + 1)
D. 24(m � 4)(m + 4)2(m + 2)