aₙ = - 7n + 7
a₁ = - 7 * 1 + 7 = - 7 + 7 = 0
a₂ = - 7 * 2 + 7 =- 14 + 7 = - 7
d = a₂ - a₁ = -7 - 0 = - 7
d = - 7
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Verified answer
aₙ = - 7n + 7
a₁ = - 7 * 1 + 7 = - 7 + 7 = 0
a₂ = - 7 * 2 + 7 =- 14 + 7 = - 7
d = a₂ - a₁ = -7 - 0 = - 7
d = - 7