book Maths Puzzle Numerical Ability

hi. i need to know how to factor this equation:

12x^3-23x^2-3x+2

i know that the answer is:

(x-2)(3x+1)(4x-1),

but i don't know how to get this result. please give me

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book Other Question
please help me find 4 consecutive numbers that total 80 (1) find the center of the circle whose equation is


x^2+ y^2-3x+8y-8=0




(2) write the equation of the circle with center (-2,1) and which passes through (3,4).