Analyzing graphs of exponential functions: negative initial value | High School Math | Khan Academy
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Given the graph of an exponential function with a negative initial value, Sal finds the formula of the function and solves an equation.
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High School Math on Khan Academy: Did you realize that the word "algebra" comes from Arabic (just like "algorithm" and "al jazeera" and "Aladdin")? And what is so great about algebra anyway? This tutorial doesn't explore algebra so much as it introduces the history and ideas that underpin it.
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