How to tell if a sequence is linear, exponential, quadratic or absolute value as simply as possible without graphing (8th grade algebra) examples will be greatly appreciated



Answer :

We will have the following:

We will be able to tel apart sequences as follows:

Linear sequence: We have that linear sequences follow the form:

[tex]y=mx+b[/tex]

Here "x" represents the iteration value for the sequence, "m" the ratio (slope) and "b" a value that modifies the "position" of the sequence. This sequences grows in a linear manner.

Example:

[tex]\begin{cases}y_{}=2x+2 \\ \\ y_1=4 \\ y_2=6 \\ y_3=8 \\ \ldots\end{cases}[/tex]

Exponential sequence: We have that exponential sequences follow the form:

[tex]y=a_1(r)^{x-1}[/tex]

Here "a1" is the first term of the sequence, "r" is the ratio and "x" the iteration of the sequence.

We obtain the ratio as follows:

[tex]r=\frac{y_n}{y_{n-1}}[/tex]

Example:

[tex]\begin{cases}y=1(5)^{x-1}_{} \\ \\ y_1=1 \\ y_2=5 \\ y_3=25 \\ \\ \ldots\end{cases}[/tex]

The ratio for this case:

[tex]r=\frac{y_3}{y_2}\Rightarrow r=\frac{25}{5}\Rightarrow r=5[/tex]

Quadratic sequence: A quadratic sequence follows the general form

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