book Maths Puzzle Numerical Ability

Can someone help me with this problem?

What would be the least common multiple of 3, 6, and 9.

Thanks!
Sher

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book Other Question

The sum of the squares of two consecutive integers is 13. Find the integers and explain your steps as you solve.
Can someone please help me with this problem I have been working on it all day.
Multiply
(x-2)(3x-6)(x+3)