sophieMoney
sophieMoney
21-11-2016
Mathematics
contestada
solve for x. 27^(2x)=9^(x-3) ...?
Respuesta :
JcAlmighty
JcAlmighty
23-11-2016
The answer is [tex]x = - \frac{4}{3} [/tex]
[tex] 27^{2x} = 9^{(x-3)} \\ (3^{3} )^{2x} = (3^{2}) ^{(x-3)} \\ \\ (x^{a} )^{b}= x^{a*b} \\ 3^{3*2x} =3^{2*(x-3)} \\ 3^{6x} =3^{(2x-6)} [/tex]
Now, logarithm both sides of the equation:
[tex]log(3^{6x} )=log(3^{(2x-6)}) \\ \\ log (x^{a}) =a*log(x) \\ 6x*log(3)=(2x-6)*log(3)[/tex]
Divide both sides of the equation by log(3):
[tex]6x=2x-6 \\ 6x-2x = -6 \\ 4x = -3 \\ x = - \frac{4}{3} [/tex]
Answer Link
VER TODAS LAS RESPUESTAS ( 57+ )
Otras preguntas
Find the product mentally. (z - 12)(z + 12) A: z2 - 144 B: z2 - 24t - 144 C: z2 + 144
Identify the 12th term of a geometric sequence where a1 = 8 and a6 = -8,192. 134,217,728 33,554,432 -33,554,432 -134,217,728
42xy-49x+30y-35 factored completely and is it prime or not
If the lake is 60 miles away and Rene is driving at 40 miles a hour the whole time how long will it take for her to get to the lake
Daniel, Emily and Thalia are attending an athletic camp this summer. They were told they had to monitor the amount of water they drink daily. The first day, Dan
Alice's grandmothers age is a composite number between 70 and 80 and has a factor of 11 what is it
how has the pursuit of order infringed on american liberties
Which algebraic property could be used to rewrite 3x ⋅ (7y ⋅ 4) as (3x ⋅ 7y) ⋅ 4? Associative Property of Addition Associative Property of Multiplication Commut
One of the goals of the system of education established by Napoleon Bonaparte was to A restrict education to the upper class B transfer control over education t
Which pair of events is dependent? You get a head and a tail in two coin tosses with two different coins. You get a head and a tail in two coin tosses using the