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

write an equation of the line passing through the given points. Write the quation in the form y= mx + b.

Need to check my break down of the answer. new at this please help me with this problem {3a+b+c=7
a+3b-c=13
b=2a-1