I wish you wouldn't use that notation. I looked it up and from what I read it means this. Let me know if it means something else: \log_6 (\frac{216^x}{1296^x})\log_x6 means this, I think:Use the rule Reduce the fraction, and use the rule Move the exponent x out front: Write as Move the exponent -1 out front as a negative sign Use the rule Edwin