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In a certain arithmetic sequence, a5=12 and a6=16. What is a1?

In A Certain Arithmetic Sequence A512 And A616 What Is A1 class=

Sagot :

Answer:

Explanation:

The nth term of an arithmetic sequence is obtained using the formula:

[tex]a_n=a_1+(n-1)d[/tex]

Given the following:

[tex]\begin{gathered} a_5=12\implies a_1+4d=12 \\ a_6=16\implies a_1+5d=16 \end{gathered}[/tex]

Subtracting, we have:

[tex]undefined[/tex]

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