Wednesday

January 28, 2015

January 28, 2015

Posted by **Seth** on Thursday, April 4, 2013 at 1:20am.

- Please help me here!!! Maths -
**Seth**, Thursday, April 4, 2013 at 1:23amSolve for the value of x: ln(x^2-6x-16)=5. Please help me work it out because I do not have an idea in work it out.

- Please help me here!!! Maths -
**Sunny**, Thursday, April 4, 2013 at 1:31am(x^2-6x-15)=e^5

e^5 is approximately 148.41

so x^2-6x=148.41-15

x^2-6x = 133.41

x-6x = sqrt(133.41)

-5x = 11.55

x = 11.55/-5

x = 2.31

- no - Please help me here!!! Maths -
**Reiny**, Thursday, April 4, 2013 at 7:37amunfortunately Sunny made several errors,

Try to sub in x = 2.31, it does not work

form his/hers : (x^2-6x-16)=e^5 ---- Sunny had -15

x^2 - 6x = 148.413 + 16

complete the square by adding 9 to both sides

x^2 - 6x + 9 = 148.413+16+9 = 173.413

(x-3)^2 = 173.413

x-3 = ±√173.413 = ± 13.1686

x = 3 ± 13.1686

x = 16.1686 or x = -10.1686

both work when subbed into the original equation

**Answer this Question**

**Related Questions**

art - generally, artists change their styles a. offen beacuse of the influence ...

Maths - Just need a bit of help understanding what exactly i have to do here to ...

maths PLEASE HELP - how to work out partial fraction decomposition when given 1/...

history - out of growth of schools, racial discrimination, and education for ...

Please Help work it out! LOGARITHM - log4(3x-7)^2=10. I have no idea in working ...

maths - can any one tell me a way of working out a percentage from a total for ...

Maths - I am trying to work out the area and perimeter of an equilateral ...

maths - how to work out partial fraction decomposition when given 1/x(x^2+1) and...

MATHS - if a student scores 58 in a maths exam predict the score they would get ...

maths - Hi again! Today in maths we were looking at ratios and probabilities, ...