487,420 views
22 votes
22 votes
If a₁ = 2 and aₙ = aₙ₋₁ - 4, then find the value of a4.

User Riteshtch
by
2.8k points

1 Answer

20 votes
20 votes

Answer

a₄ = -10

Step-by-step explanation

If a₁ = 2 and aₙ = aₙ₋₁ - 4, then find the value of a₄.

We already know that

a₁ = 2

a₂ = a₁ - 4

a₃ = a₂ - 4

a₄ = a₃ - 4

Doing the substitutions

a₂ = a₁ - 4

a₂ = 2 - 4 = -2

a₃ = a₂ - 4

a₃ = -2 - 4 = -6

a₄ = a₃ - 4

a₄ = -6 - 4 = -10

Hope this Helps!!!

User David Welch
by
2.6k points
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.