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solving exponential equations: -6^(4x - 5) = -20  TOPIC_SOLVED

So I'm stuck on this question: -64x-5=-20
I know that I'm supposed to use log to isolate the variable, but I can't take the log of a negative number.
Could someone please explain how to solve this in steps? :confused:

Thanks
by sully039
on Mon Jul 25, 2011 8:43 pm
 
Forum: Intermediate Algebra
Topic: solving exponential equations: -6^(4x - 5) = -20
Replies: 2
Views: 917

Re: solving exponential equations: -6^(4x - 5) = -20  TOPIC_SOLVED

Oh...right :oops: I feel kinda dumb now lol

Thanks for the help
by sully039
on Tue Jul 26, 2011 1:07 am
 
Forum: Intermediate Algebra
Topic: solving exponential equations: -6^(4x - 5) = -20
Replies: 2
Views: 917

exponential word problem  TOPIC_SOLVED

The Mckinney family has a pond in their yard with water lillies. The area of the lilies' leaves cover twice as much of the pond as they did 35 days ago. The leaves will completely cover the pond in 80 days if they continue to grow unchecked. The McKinneys want to cut back the lilies when they have c...
by sully039
on Wed Jul 27, 2011 3:32 pm
 
Forum: Intermediate Algebra
Topic: exponential word problem
Replies: 3
Views: 935

Re: exponential word problem  TOPIC_SOLVED

So you mean to use the half life equation like this? :y=c(1/2)35/h
2c=c(1/2)35/h
But when I do this, half life is equal to -35...
:confused:
by sully039
on Wed Jul 27, 2011 7:53 pm
 
Forum: Intermediate Algebra
Topic: exponential word problem
Replies: 3
Views: 935

tanx=-4.25  TOPIC_SOLVED

I can't figure out this problem: Determine all possible values of x to one decimal place, for -pi<x<3pi
tanx=-4.25
To start off, how would I get the reference angle?
Oh and the answer is supposed to be -1.3, 4.9, 8.1

Thanks
by sully039
on Wed Aug 03, 2011 12:29 am
 
Forum: Trigonometry
Topic: tanx=-4.25
Replies: 4
Views: 1301

Re: tanx=-4.25  TOPIC_SOLVED

The thing is I tried getting the inv of tan but my tutor said that that wasnt't the way to get the reference angle... :confused:
by sully039
on Thu Aug 04, 2011 1:42 am
 
Forum: Trigonometry
Topic: tanx=-4.25
Replies: 4
Views: 1301

Re: tanx=-4.25  TOPIC_SOLVED

Hey guys it turned out I did have to do tan-14.25 but without the negative sign -_-
So the reference angle would be 1.34 and then i was able to find the other values.

Thanks for the help :mrgreen:
by sully039
on Fri Aug 05, 2011 1:21 am
 
Forum: Trigonometry
Topic: tanx=-4.25
Replies: 4
Views: 1301

exact value of sin(5pi/6-2pi)?  TOPIC_SOLVED

I'm not sure if I'm suppossed to find the value of 5pi/6 (which is 1/2) and then subtract 2pi from it. Or is it sin(5pi/6)-sin(2pi)? Also, can anyone tell me how to figure out the equation of this tangent? I think the answer is tan(x-pi/4)-1, but I'm not sure. Graph is in link below. http://imagesha...
by sully039
on Fri Aug 05, 2011 10:44 pm
 
Forum: Trigonometry
Topic: exact value of sin(5pi/6-2pi)?
Replies: 1
Views: 1790

Word problem on rates of change  TOPIC_SOLVED

Q) A crystal in the shape of a cube is growing in a test tube. Estimate the rate at which the surface area is changing with respect to the side length when the side length of the crystal is 3cm. This question is from a lesson based on instantaneous rates, rate of change, etc. I don't really understa...
by sully039
on Fri Aug 12, 2011 1:38 am
 
Forum: Intermediate Algebra
Topic: Word problem on rates of change
Replies: 4
Views: 1541

Re: Word problem on rates of change  TOPIC_SOLVED

Well so far, I've learned to find instantaneous rates of change by setting up a table with intervals of numbers that approach x in (x,y). Using these intervals I'd then substitute the numbers into the model's equation and find change in f(x)/change in x. But for this problem they do not give me an e...
by sully039
on Fri Aug 12, 2011 3:42 pm
 
Forum: Intermediate Algebra
Topic: Word problem on rates of change
Replies: 4
Views: 1541
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