Answer
a₄ = -10
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!!!
