Question

If d = −3, n = 4 and an = 0, find a.​

Answer 1

Step-by-step explanation:

a+(n-1)d=an

a+(4-1)-3 =0

a+3(-3)=0

a-9=0

a=9

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Answer 2

Answer:

a=9

Step-by-step explanation:

an = a + (n-1)d

$0 = a + (4 - 1) - 3 \\ - a = 3 \times - 3 \\ - a = - 9\\ a = 9$