Sunday

March 1, 2015

March 1, 2015

Posted by **Kayla** on Sunday, March 20, 2011 at 8:42pm.

log5(x+4)+log5(x+1)=2

- acc. alg 2 -
**bobpursley**, Sunday, March 20, 2011 at 8:45pmremember log a + log b= log ab

do that, then take the antilog..

log5 (x+4)(x+1)=2

(x+4)(x+1)=25

then proceed to solve.

- acc. alg 2 -
**Damon**, Sunday, March 20, 2011 at 8:52pmlog5 [(x+4)(x+1)] = 2

5^log5 [(x+4)(x+1)] = 5^2 = 25

(x+4)(x+1) = 25

x^2 + 5 x + 4 = 25

x^2 + 5 x - 21 = 0

x = [-5 +/- sqrt(25+84) ]/2

= [-5 +/- sqrt(109)]/2

= [ -2.5 +/- 5.22 ]

= 2.72 or - 7.72

You can not take log of a negative number so use 2.72

- acc. alg 2 -
**Kayla**, Sunday, March 20, 2011 at 9:10pmi dnt get bwat u did after x^2+5x-21=0. that is were i keep gettin stuck on

- acc. alg 2 -
**Damon**, Monday, March 21, 2011 at 9:13am

**Answer this Question**

**Related Questions**

precalculus - solve the logarithmic equation . express solution in exact form ...

Algebra - solve the eauation check for extraneous solutions. log5 x=4

Algebra 2 - Express as a logarithm of a single number or expression: 1. 5log4^p+...

Algebra II - Log6(6^9)=??? Answer: 9 Ine^-3x=??? Answer: -3x Use log5(2) = 0....

college algebra - solve the logarithmic equation. Please show all work. log5x+...

mathematics - Given that log5 3=0.683 and log5 7=1.209.without using calculator...

Maths - Solve for x: log5(x-2)+ log5 (x-4) = log6(x-1)

Logs-Algebra - How do you graph the following logs? f(x)=log5 (x-2) f(x)=log5 x-...

check! - here is the question: log5(x-4)= log7x solve for x. These are just base...

Algebra II Help - How do you solve this ; 5^(3y) = 8^ (y-1) I think the first ...