book Maths Puzzle Numerical Ability

Find and simplify P(a+h)-P(a) given P(x)=x^2-2x

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book Other Question

Points A,B,C and D lie on the same line and in that order. The ration of AB to AC is 1/4 and the ration of BC is 1/2. Find the ratio of AB to CD.

I have no idea how to even start! Hello again. I have one more question and then I'll try to figure out the rest of them on my own. Again, I'd appreciate any help.

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