Quadratic,Linear, Exponential Function

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• y is the final amount.
• a is the initial amount (what you start with when x = 0).
• b is the growth/decay factor. This is the multiplier for each unit of x.
• x is often time or the number of periods.

The value of b tells you everything:
* If b > 1, you have exponential growth. The quantity is increasing.
* If 0 < b < 1, you have exponential decay. The quantity is decreasing.
* b cannot be 1 (because 1^x is always 1, which is just a constant line) and cannot be negative (it would jump between positive and negative values oddly).

A quadratic equation is any equation that can be rearranged into the form $ax^2 + bx + c = 0$, where $a$, $b$, and $c$ are numbers, and $a
eq 0$. The solutions (also called roots or zeros) are the values of $x$ that make the equation true. There can be zero, one, or two real solutions.