Question

Find the first, fourth, and eighth terms of the sequence. A(n) = −5 ∙ 3x − 1

Answer 1

Welcome dear,

● Answer -
A(1) = -5
A(4) = -135
A(8) = -10935

● Explaination -
First term in series -
A(1) = -5 × 3^(1-1)
A(1) = -5 × 1
A(1) = -5

Fourth term in series -
A(4) = -5 × 3^(4-1)
A(4) = -5 × 3^3
A(4) = -5 × 27
A(4) = -135

Eighth term in series -
A(8) = -5 × 3^(8-1)
A(8) = -5 × 3^7
A(8) = -5 ×
A(8) = -10935

Hope this helps you...

Answer 2

Answer:

Step-by-step explanation:

Given Find the first, fourth, and eighth terms of the sequence.A(n) = −5 ∙3^n − 1

So first term of the sequence is x = 1

 A(n) = A(1) = - 5 . 3 ^1-1 = - 5 . 3^0 = - 5

So fourth term is x = 4

A(n) = A(4) = - 5 .3^4 - 1 = - 5 . 3 ^3 = - 135

A(n) = A(8) = - 5 . 3^8 - 1 = - 5 . 3^7 = - 2187

So the numbers of the sequence are - 5, - 135 and - 2187