book Maths Puzzle Numerical Ability

Factor: x^3-5x^2+x+15=0

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book Other Question

the numerator of a fraction is 4 less than the denominator. if both the numerator and the denominator are both increased by 2, the resulting fraction is equivalent to 2.

i dont 1/x + x/2x+4 - 2/x^2 +2x