Saturday

November 22, 2014

November 22, 2014

Posted by **Neee** on Thursday, August 12, 2010 at 6:37pm.

ln(x + 4) + ln(x + 2) = 2

ps - we aren't allowed calculators

My ans:

I got as far as

ln [(x+4)(x+2)] = 2

ln (x^2+6x+8) = 2

And then I am lost, whatever I do ends up with no answer.

I also rewrote the above so that it is

e^2 = x^2+6x+8

But of course that made it worse :(

- Maths -
**Damon**, Thursday, August 12, 2010 at 8:19pmI am also stuck just as you are.

- Maths -
**jai**, Friday, August 13, 2010 at 5:04ami also got the same equation:

ln [(x+4)(x+2)] = 2

ln (x^2+6x+8) = 2

x^2+6x+8 = e^2

x^2+6x+(8-e^2)=0

thus, you have no choice but to use quadratic formula: (where a=1, b=6, c=8-e^2)

[-6+-sqrt(6^2-4(1)(8-e^2))]/2(1)

[-6+-sqrt(36-32+4e^2)]/2

[-6+-sqrt(4+4e^2)]/2 *factor out 4

[-6+-2(sqrt{1+e^2})]/2

therefore, x is equal to:

-3+sqrt(1+e^2) and -3-sqrt(1+e^2)

so there,, =)

**Answer this Question**

**Related Questions**

6th grade math - Can you check these inequalities? 1. Chancellor is saving $15 ...

Math - The cost C, in dollars, to produce graphing calculators is given by the ...

chem - an aq. solution(NaCl) made by using 133g diluted to a total solution ...

12th grade maths - just like to check if ive got these right. if not can you ...

12th grade maths - just like to check if ive got these right. if not can you ...

word problem - A manufacturer of graphing calculators has determined that 11,000...

College Physics - A students stands at the top of a high vertical cliff and ...

Maths - Given that y=x^2+2x-3 When x is -3 what is y? Is the ans 0? When x is 1 ...

Algebra - please help me with this question and check my answers. Solve the ...

Math - Limits/Derivatives - Suppose that for a company manufacturing calculators...