Posted by Ang on Friday, October 26, 2007 at 10:20pm.
9^(x - 9)/8= sqrt of 9
i got 13
Correct!
______________________
4^(x + 10) = 8^(x - 6)
i got 38
Correct! Here's my work:
4^(x+10)=(2^2)^(x+10)
8^(x-6)=(2^3)^(x-6)
2(x+10)=3(x-6)
Distribute
2x+20=3x-18
-x=-38
x=38
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Solve the exponential equation. Express the solution set in terms of natural logarithms.
2^8x = 4.5
i got {ln 4.5/8 ln 2}
Correct! I checked the answer with my calculator for you. It's right! :-)
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Solve the exponential equation. Express the solution set in terms of natural logarithms.
4^(x + 4) = 5^(2x + 5)-This question I dont understand.
I'm not sure I do either. I'll post back if I figure it out. Sorry.
4^(x + 4) = 5^(2x + 5)
Take logs to base e of both sides
(x+4) ln4 = (2x+5)ln 5
(x+4)/(2x+5) = (ln5)/(ln4)= 1.161
Solve for x
1,2,3,4
what is x
4 - x/4 = 5
7
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