f(2x+1)=3x-1,f(a)=4,a=___ Using the method of substitution to solve the problem

f(2x+1)=3x-1,f(a)=4,a=___ Using the method of substitution to solve the problem

Let a = 2x + 1
f(a)=f(2x+1)=3x-1=4
x=5/3
a=2x+1=13/3

The range substitution method f (x) = 2x ^ 2-2x + 3 / x ^ 2 + 3x + 5
There is also the solution or image of F (x) = x + 6 / X

y=(2x^2-2x+3) / (x^2+3x+5)
(Y-2) x ^ 2 + (3Y + 2) x + 5Y + 3 = 0
The equation must have a root, and the range of Y from Δ≥ 0 is the range of value
Is the second question y = (x + 6) / X or y = x + 6 / x
y=(x+6)/x = 1+ 6/x
6/x≠0 ∴y≠1
y= x +6/x
When x > 0, y = x + 6 / X ≥ 2 √ 6 [using mean inequality a + B ≥ 2 √ AB]
When x

Are you a teacher

Are you a teacher?

I hope to be a teacher like him

I want to be a teacher like him.

In a word, thank you. It is impossible for a singer who has just studied singing for one year to become a singer

It is impossible for a singer who has just studied singing for a year to become a singer
① It is impossible for someone to become a singer with only one year of experience.
② It is impossible for someone with only one year of experience to become a singer.
③ It is impossible for a person to become a singer with only one year of practice.
Are you cold there? Xiaobai, are you cold there?

English translation

His mother is an English teacher of Peking University.

My father's car. She is an English teacher

my father's car
She is an English teacher.

He used to be an English teacher, but now he is a translator

He used to be an English teacher.and now he is a translator.

English translation
Can you sing or dance well?
I can sing well (Dance)

Online, found some answers
Can you sing or dance well?
I'll ask my English friend for you tomorrow
I'm also going to help you forward your questions and let more people participate in answering them. If there are better answers, I'll give you feedback

I like dancing, but I haven't had a chance to try it

I like **, unfortunately, haven't got the change to do it.