book Maths Puzzle Numerical Ability

Factor the polynomial completely, given that the binomial following it is a factor of the polynomial.

w^3+5w^2-w=5

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book Other Question

What values for x must be excluded in the following fraction?

x-3/(4x-5)(x+1)
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