Posted by Ellie on Sunday, October 25, 2009 at 8:45pm.
You are close. You have an error:
Your step:
a_n = 21 + (n - 1) - 8
should be:
a_n = 21 + (n - 1) * (-8)
oh yeah sorry i wrote that wrong i put -168-8n but it still said my answer was wrong
a_n = 21 + (n-1)*(-8)
Expand that using the distributive law.
The first term, 21, is not multiplied by -8. Only the terms in parenthesis are multiplied by -8.
i figured out what i was doing thank you so much!
You're very welcome.
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