Posted by Ellie on Sunday, October 25, 2009 at 8:45pm.
-Write the arithmetic sequence 21,13,5,-3... in the standard form:
why isnt this right?
math - Quidditch, Sunday, October 25, 2009 at 9:00pm
You are close. You have an error:
a_n = 21 + (n - 1) - 8
a_n = 21 + (n - 1) * (-8)
math - Ellie, Sunday, October 25, 2009 at 9:03pm
oh yeah sorry i wrote that wrong i put -168-8n but it still said my answer was wrong
math - Quidditch, Sunday, October 25, 2009 at 9:15pm
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.
math - Ellie, Sunday, October 25, 2009 at 9:54pm
i figured out what i was doing thank you so much!
math - Quidditch, Sunday, October 25, 2009 at 10:03pm
You're very welcome.
math - Edward, Sunday, November 30, 2014 at 12:17am
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