Articles
Register
Sign In
Search
RodriguesFernanda
@RodriguesFernanda
January 2020
2
90
Report
(PAES)Os valores de x que satisfazem a equação log(x^2-15)=2 são
Please enter comments
Please enter your name.
Please enter the correct email address.
Agree to
terms and service
You must agree before submitting.
Send
Lista de comentários
Comentários
Verified answer
Conceitualmente
x^2 - 15x = 10^2
x^2 - 15x - 100 = 0
Fatorando
(x - 20)(x + 5) = 0
x - 20 = 0
x1 = 20
x + 5 = 0
x2 = - 5
S = {- 5, 20}
OS VALORES SÃO - 5 E 20
0 votes
Thanks 1
Nooel
Usando a propriedade de log que será
Logₐ B= X ⇒ B=aˣ
Log(x²-15x)=2
x²-15x=10²
x²-15x-100=0
Bhaskara
Δ=-15²-4.1.(-100)
Δ=225+400
Δ=625
X=15+-√625/2
X'=15+25/2 = 40/2 = 20
X''=15-25/2 = -10/2 = -5
S= (20 , -5)
Letra D
1 votes
Thanks 1
More Questions From This User
See All
RodriguesFernanda
January 2020 | 0 Respostas
Responda
RodriguesFernanda
January 2020 | 0 Respostas
Responda
RodriguesFernanda
January 2020 | 0 Respostas
Responda
RodriguesFernanda
January 2020 | 0 Respostas
Responda
RodriguesFernanda
January 2020 | 0 Respostas
Responda
RodriguesFernanda
January 2020 | 0 Respostas
Responda
RodriguesFernanda
January 2020 | 0 Respostas
Responda
RodriguesFernanda
January 2020 | 0 Respostas
Responda
Recomendar perguntas
Deividyfreitas
May 2020 | 0 Respostas
BlackShot
May 2020 | 0 Respostas
Vanessakellen
May 2020 | 0 Respostas
Guiduarter
May 2020 | 0 Respostas
Mrzaine
May 2020 | 0 Respostas
O QUE SERIA AUTONOMIA?
Grazifer
May 2020 | 0 Respostas
Joazinho
May 2020 | 0 Respostas
a palavra rapidez formou se de qual derivacao
Celiana
May 2020 | 0 Respostas
Joazinho
May 2020 | 0 Respostas
Anatercia
May 2020 | 0 Respostas
×
Report "(PAES)Os valores de x que satisfazem a equação log(x^2-15)=2 são.... Pergunta de ideia de RodriguesFernanda"
Your name
Email
Reason
-Select Reason-
Pornographic
Defamatory
Illegal/Unlawful
Spam
Other Terms Of Service Violation
File a copyright complaint
Description
Helpful Links
Sobre nós
Política de Privacidade
Termos e Condições
direito autoral
Contate-Nos
Helpful Social
Get monthly updates
Submit
Copyright © 2024 ELIBRARY.TIPS - All rights reserved.
Lista de comentários
Verified answer
Conceitualmente
x^2 - 15x = 10^2
x^2 - 15x - 100 = 0
Fatorando
(x - 20)(x + 5) = 0
x - 20 = 0
x1 = 20
x + 5 = 0
x2 = - 5
S = {- 5, 20}
OS VALORES SÃO - 5 E 20
Logₐ B= X ⇒ B=aˣ
Log(x²-15x)=2
x²-15x=10²
x²-15x-100=0
Bhaskara
Δ=-15²-4.1.(-100)
Δ=225+400
Δ=625
X=15+-√625/2
X'=15+25/2 = 40/2 = 20
X''=15-25/2 = -10/2 = -5
S= (20 , -5)
Letra D