Hi:) anyone able to help with 4(a) ? question in the pic attached :) thanks!

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Work Shown:

This is in the form with a = 2 and b = -1

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note: for this line, I expanded each pair of multiplying binomials. In the numerator, I used the box method as shown in the diagram below. Each inner cell is the result of multiplying the corresponding outer cell expressions. Example: for row2, column1, we have . The other cells are filled out in a similar fashion. In the denominator, I used the difference of squares rule.

step-by-step explanation: i dont

6mm^3 or .6cm^3

      216

      /   \

  36     6

  /   \     /

6     6   6

factor trees are nice.