Question

8x2-15=1
3+c=12
Are these true false or open sentences. I am trying to help my 7th grader

Answer 1

Is your first equation " eight times two - 15 = 1" ? or "eight x squared - 15 = 1" ?

Answer 2

The first one is true, the second one c=9

Answer 3

3+c=12
c=9

Answer 4

best response!?!

Answer 5

how is the first one true?

Answer 6

8*2=16, add the 15 to the opposite side you get 16=16

Answer 7

? that's not right i'm sorry

Answer 8

YES IT IS!!!

Answer 9

What is the second problem? Thank u for your help

Answer 10

\[8x^2-15=1 \]
\[8x^2=16\]
\[x^2=2\]
\[x=\sqrt{2}\]

Answer 11

I could be wrong.

Answer 12

Subtract 3 from both sides and you get c=9

Answer 13

It is 7th grade math they dont do that

Answer 14

um yes they do. clearly they are taking algebra so they must know that.

Answer 15

Umm... Clearly you dont know what you are talking about

Answer 16

And you completely ignored the 8X2 that could be a variable not really a multiplication sign

and I do know what I'm talking about seeing as i am IN IB MATH so please don't underestimate my intelligence

Answer 17

@Mmcs511 Can you please verify the question?

Answer 18

It is clearly multiplication, and just because you are in that math doesn't mean you know what you are talking about...geez

Answer 19

I think its 8 times 2 :)

Answer 20

If they way you said is right then I give it to you. But we don't know if it's a variable or not.

Answer 21

Okay then @marktj you were right.

Answer 22

Thanks for mentioning me!!

Answer 23

And I'm not telling you that you don't know what you're talking about. I was just saying that I thought you were wrong.

Answer 24

Well im not

Answer 25

Okay? And I recognized that.

Answer 26

That im right?

Answer 27

Yes. I recognized that you were right.

Answer 28

Thank you soo much. It means a lot that i know we were able to put our egos aside and resolve this.

Answer 29

Okay.

Answer 30

No problem (: @marktj

Answer 31

Thanks @jordyn77

Answer 32

What Is the answer to the second proble

Answer 33

Since @Mmcs511 hasn't yet replied to my original question, I don't think we'll ever know 100% what exactly the first problem was asking.

I *assume* that since this is 7th grade math asking about whether or not an equation is true/false, the first one means "eight TIMES 2"
8*2 -15 = 1
16 -15 = 1
1 = 1
TRUE

The second equation comes with no other info. It didn't ASK to solve for c... it just said "is the equation true?"

Without a value of c given, we can't tell if it's true or false.

That's my two cents on it. :-p

Answer 34

Dibs on best response.. LOL

Answer 35

Thank you