SOLUTION: The 31st term of an AP whos first two terms are respectivly -2 and -7 is...

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Question 959015: The 31st term of an AP whos first two terms are respectivly -2 and -7 is...
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
a%5B0%5D%2Bd=-2
a%5B0%5D%2B2d=-7
Subtracting,
a%5B0%5D%2B2d-a%5B0%5D%2Bd=-7-%28-2%29
d=-5
Then,
a%5B0%5D-5=-2
a%5B0%5D=3
So,
a%5B31%5D=3%2B31%28-5%29
a%5B31%5D=3-155
a%5B31%5D=-152