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OpenStudy (anonymous):
How to solve: (1/9)^x=729
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OpenStudy (anonymous):
ln(1/9)^x = ln 729 xln(1/9)=ln 729 does that help
OpenStudy (anonymous):
Yes let me try it
zepdrix (zepdrix):
Are you allowed to use a calculator on this Chris? If not, it's a little tricky. You need to notice that both numbers are divisible by 3. So we can rewrite the left AND right side using some clever algebra.
OpenStudy (anonymous):
yes i am allowed a calculator
zepdrix (zepdrix):
Oh ok cool :)
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OpenStudy (anonymous):
got it its -3 correct?
OpenStudy (anonymous):
x=-3
zepdrix (zepdrix):
Yes looks good!
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