book Maths Puzzle Numerical Ability

hello, i need more help on these problem is factor out perfect squares ?

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(x-1)(x+2)(2x-3)(3x-6)(x+1)=0
the no of possible values of x that are integer
Suppose C=(2,8,9), D=(4,8,12), and E=(6,8,9).
a. Find (C union D)intersection E b.Find C union(d intersection E)