exam Maths Puzzle Numerical Ability

how can i factorize this sum x^3-x^2+ax+x-a-1 ? please help me thanks

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My problem is a division one....

(P^-5)^-9(P^-6)^4 divided (P^-8)^0(P^4)^-5

I need help with this one......negative exponents The number of bacteria in a large sealed jar doubles every minute. An hour after the first bacteria was put into the jar and sealed in, the jar was full. When was it half full?