book Maths Puzzle Numerical Ability

how can i step by step factorize-
a(a-1)x^2 + x - a(a+1)

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book Other Question

Find the slope of the segment AB where A(2,-1) and B(6,-4) Please help with problem: alvin is mowing his front lawn.His mailbox is on the edge of the lawn.Draw a reasonable graph that shows the distance Alvin is from the mailbox as he mows