Calculating Difference Quotients for Scientists

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martina1075
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Homework Statement
Can someone help me understand what was done in every step please?
Relevant Equations
As per picture
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If you do not understand a single step, even the first one, then either you have not worked hard enough at it or you do not have the prerequisite math to understand it. Every step is very routine algebra. Algebra is a prerequisite to understanding calculus.
 
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