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OpenStudy (anonymous):
Triangular pattern. 1, -3, 6, -10, -21, 28. I know the pattern but how do I get to go negative then positive.
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OpenStudy (anonymous):
multiply by negitve -1
Directrix (directrix):
@JRHarrison90 What did you get for the nth term of the sequence?
OpenStudy (anonymous):
add (-1)^n-1 as a factor
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