book Maths Puzzle Numerical Ability

factor the following sums or differences of two cubes
b^3-8

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book Other Question

Im learning about factoring Trinomials by grouping and there is one problem I am having some trouble with. its 4r2(the 2 is the exponent) + 3r - 10 Sammy has 4/9 of a share of Microsoft stock. He gave 1/18 of what he had to each of his grandchildren. How many grandchildren does he have?