Can someone help me understand 21?
Can someone help me understand 21?
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-31
-25
its 4
this
this
how old are you OP? I knew how to do that shit and im a history major
-25
You sub 7 in for each instance of X, so you get
(7)2 - 6(7) +3
which simplifies to
14-42+3
17-42
=-25
Underage b&
It's 31 you pemdasing faggots
Underage ban
Also pic related to your question
x2-6x+3 x=7
(7)2 - 6(7)+3
14 - 42 + 3
= -25
This.
OP here, i got it to -25 too, but according to the answer sheet in the book it's 10. How is this possible?
21 times 2 = 44 minus 6x = 4 plus 3 = 7
lrn 2 math faggot
The idea is that x is a variable--it's holding the place for some number. We don't know what number that is, but we still want to talk about it, so we give it a name, x.
The expression is:
> x2 - 6x + 3
Then we want to run that expression, for a x-value of 7.
So,
> (7)2 - 6(7) + 3
Order of operations: PEMDAS
Nothing to do inside the Parenthesis, so move on to the Exponents:
> 49 - 6(7) + 3
There's a Multiplication, and no Divisions,
> 49 - 42 + 3
Then we run through the Addition and Subtraction, left-to-right:
> 7 + 3
> 10
2+2=4-1=3 quik mafs
you were previously asking for 19 you underage faggot. get b&
How did you get it to 49?
I think the x2 is supposed to be x squared so in this case the answer is 10
>
are you retarded or just 10?
21x2 does not equal 44
you are wrong
if it was x squared it would be x^2. I think the teacher is trying to throw the students off with the fact that the placement of the x is trivial.
The answer is SEVEN you god-damn illiterate faggots. It says EQUALS SEVEN right fucking there. All you all fucking autistic or just legit retarded?
kek
Some formatting problems.
x2 is meant to be x^2, as in "x-squared"
Likely the website you're using for homework is having a hard time rendering the superscript, so just shows 'x 2'
42, 44 whatever fucktard. The math still works since the difference is basically nothing.
this
x 2 means x power 2 (7*7)=49
the 13 and 12 also have space between them, does that mean x=1^3 & x=1^2 in the questions before?
This
in that case OP is indeed a dumb kid
OP you did the wrong thing by asking Sup Forums this question. Their idiots are showing.
go to /sci/
Or OP's teacher is illiterate who doesn't know how to write mathematical equations on computer.
this
(7*2) - (6*7) + 3
14 - 42 + 3 = -25
Oh look, another PEMDAS thread..
OP here. Can anyone help with 23? How to think
>know how to write mathematical equations on computer
I suspect they're OCR-ed from a printed textbook into plain text.
>the 13 and 12 also have space between them
Fair point, but the x^2 makes sense in this context--straight-forward underagebanned prealgebra questions.
dubs of truth
I had to link my lecturer to this because he kept doing his equs on MSword like a chimp
X2= X2
> 23. 4 + 5 ( x - 7 ) 3
Again, I think the formatting hinders your understanding. But look back to your notes from class, or the examples in the section. It should be:
> 4 + 5*(x-7)^3, where x=9
Follow the thought process here
According to the answer sheet it's 44, how?
23. 4+5*(x-7)^3
4+[5(9-7)^3]
4+[5(2^3)]
4+[5*8]
4+40=4
This is easy shit OP, fucking stop asking for help and learn to do it yourself.
fuck, it's 44 not 4
Its not 44, your teacher is clearly mentally challenged.
>how?
This user did it well: (Except, as they noted , it should end in a 44.)
>40+4=4
To be fair OP is clearly a moron, but can we talk about his teacher being a complete fucking idiot who can't be bothered to write equations that are clear?
>it just works
We have sunk to a new low
Fuck this professor OP. Get all the answers wrong then sue to get him fired for incompetence.
No.
It's like this
72-67+3 = 8
This piece of shit format has no superscript, you should ask for a refund if you paid for it. Whoever wrote this should also be fired.
...
fuck
this.
to be power 2 it would be x2 or x^2
fucking hell