exam Maths Puzzle Numerical Ability

Please help this is confusing to me.
Factor each polynomial by grouping the first two terms and the last two terms.
x^3 - 4x^2 + 2x -8

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exam Other Question

What would the graph of the quadratic function {y=ax(7+3x),a is less than 0} look like? Find the closed form of the following recursive function: a(n)=5*a(n-1) where a(0) is the initial value.