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calculate the value of the 1st term for the geometric sequence

Calculate The Value Of The 1st Term For The Geometric Sequence class=

Sagot :

we know taht

the explicit formula for an arithmetic sequence is equal to

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

In this problem we have that

[tex]a_n=-7+6n[/tex]

we know that

the distance betwee consecutive numbers is 6

that means

the common difference is d=6

substitute the value of d in the first equation

[tex]\begin{gathered} a_n=a_1+6(n-1) \\ a_n=a_1+6n-6 \end{gathered}[/tex]

Equete both equations

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