Respuesta :
Answer:
x= (2lg6+7)/(1-lg6)
x= (2*0.78+7)/(1-0.78)=8.56/0.22=38.9
Step-by-step explanation:
(x+2)lg 6=(x-7)lg10
but lg10=1
so x*lg6+2lg6=x-7
-x*lg6 -x*lg6
2lg6=x-x*lg6-7
+7 +7
2lg6+7=x*(1-lg6)
so x= (2lg6+7)/(1-lg6)
Answer:
6^x +2 = 10^x +7
First take logarithm to base 6 to both sides
That's
log 6 6^x+2 = log 6 10^x+7
We get
x + 2 = log 6 (10) x - 7log 6 10
Move the constants to the right side of the equation
We get
x - log 6 (10)x = - 7log 6 (10) - 2
Factor out x from the expression
We get
( 1 - log 6 (10)x = - 7 log 6 (10) - 2
Divide both sides by 1 - log 6 (10)
We get
x = - 7 log 6 (10) - 2 / 1 - log 6 (10)
Rewrite the expression
x = log 6 (10^-7) - log 6 ( 6^-2) / log 6 (6) - log 6 (10)
Simply the expression
x = log 6 ( 10^-7 × 6^-2)/ log 6 (6/10)
x = log 6 ( 1 / 36 × 10^7) / log 6 (3/5)
Using log b (x) / log b (a) = log a (x)
Write the expression as
x = log 3/5 ( 36 × 10^-7)
x = - log 3/5 ( 36 × 10^7)
x = 38.568
Hope this helps.
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