Geometric sequences grade 12: solve for x

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Solve for x if the sequence is geometric. This is part of geometric sequences grade 12.

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Sir can we use the -1<r<1 here instead

lia.CtrrEe
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Kevin really said factorise if u brave 😂

Ismail_khan_
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With the two answers do we just test then both or there a definite way to know which is correct?

williamchikomwe