book Maths Puzzle Numerical Ability

directions: find all the roots of each equation.

2x^3+3x^2-6x-9=0

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book Other Question

A board game for 2 to 6 players has a deck of cards that can always be divided evenly among all the players. What is the smallest numbers of cards that are possible? Can someone please help find the LCM
(x-1)^3(x+1); (x-1)(x+1);(x-1)^2(x+1)^2

Thanks for your help.