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Please help me on my question I need help on. 2

Please help me on my question I need help on. 2-example-1

1 Answer

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Given for question 2:


a=-7,r=-4

The general form of the geometric sequence is:


a_n=a_1\cdot r^(n-1)

substitute with the given values of a and r:


a_n=(-7)\cdot(-4)^(n-1)

To find the fourth term, substitute with n = 4

so, the fourth term will be:


\begin{gathered} a_4=(-7)\cdot(-4)^(4-1) \\ a_4=(-7)\cdot(-4)^3 \\ a_4=-7\cdot(-64) \\ a_4=448 \end{gathered}

so, the answer will be the fourth term = 448

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