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OpenStudy (anonymous):
find all numbers for which the rational expression is undefined 6z / z^2 +2
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jimthompson5910 (jim_thompson5910):
It's undefined when the denominator is zero, so you just need to find the values of 'z' that make z^2 + 2 equal to zero
jimthompson5910 (jim_thompson5910):
ie, solve z^2 + 2 = 0 for z
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