book Maths Puzzle Numerical Ability

solve x(x-1) = 3x + 2

I got x^2 - x = 3x + 2
x^2 - 4x - 2 = 0

im stuck!

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book Other Question

Find the nth term formula for the geometric sequence whose first term is 18 and whose second term is 9. how would i work this problem out :3x-y=1