2 years ago

Find a1 when d= - 1 and a7= -2

Mathematics

1 answer:

Pie2 years ago

5 0

Answer:

a₁ = 4

Step-by-step explanation:

Given

d = - 1
a₇ = - 2

Find a₁

Use the nth term equation of AP

aₙ = a₁ + (n - 1)d

Apply to the given case and solve for a₁

- 2 = a₁ + 6(- 1)
- 2 = a₁ - 6
a₁ = 6 - 2
a₁ = 4

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