# Exponential Functions?!

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The part in parenthesis is up at top like an exponent. I dont' know how to do this. Please help me.

• Exponential Functions?! -

find the value of x such that
9^(2x-3) = 4
ln both sides
(2x-3) ln9 = ln4
2x-3 = ln4/log9
2x = 3 + ln4/ln9
x = (3 + ln4/ln9)/2 = appr 1.82

so x > 1.82

check:
let x = 1.81
LS = 9^(.62) = 3.905..... < 4
let x = 1.83
LS = 9^(.66) = 4.26.. > 4

• Exponential Functions?! -

Ah, thank you so much!!! GOd bless you!

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