exam Maths Puzzle Numerical Ability

factor by grouping:

9x^3 - 54x^2 - 18x^2 + 108x

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exam Other Question

Simplify

(7+square root of 6)(7- square root of 6) Just a quick question.
I built a shelf. Its going to be 24" from the wall at a height of 38". How long do I make my braces from the front edge to the back at floor level?