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10th term is - 25; 15th term is - 40
what is the first term, common difference and nth term?​

Sagot :

MATH3493IN

Step-by-step explanation:

n = 6

a10 = -25

a40 = -40

-40 = -25 + (6-1) d

-40 = -25 + 5d

25-40 = 5d

-15 = 5d

-3 = d ( Common Difference )

-40 = a1 + ( 15 - 1 ) -3

-40 = a1 + (14)-3

-40 = a1 + -42

42-40 = a1

2 = a1 ( First Term )

Hope it helps

Brainliest pls

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