Question

(-2n+(-9)-(-7n+(-6)) I keep missing these kinds of problems. Explain please?

Answer 1

So many grouping symbols :D
Could you first make sure that you copied that correctly? :)

Answer 2

Yes that is it in all it's computer app glory.

Answer 3

HOLD ON
I LIED

Answer 4

Theres more....:c

Answer 5

<whistles>
Okay... put down the correct problem first :)

Answer 6

(-2n+(-9)) - (-7n+(-6))

Answer 7

Better now?

Answer 8

I don't know, is it?
You're the one that should know if it's copied correctly, is it okay now? :)

Answer 9

Yusshh, I know the basic rules. But I fail at the ones with a billion parenthesis.D:

Answer 10

Yes, okay, let's begin... this'll be a nightmare :D

Answer 11

\[\large (-2n+(-9)) - (-7n+(-6))\]

Answer 12

Let's get rid of the grouping symbols, ok?

Answer 13

This part right here...
\[\large (-2n+(-9)) \color{red}{- (-7n+(-6))}\]
Let's simplify it :)

Answer 14

What does a minus sign outside parentheses do?

Answer 15

Make a figure negative!

Answer 16

It inverts the sign of every term inside...
so the
-7n and the -6 both get their sign inverted :)

Answer 17

So, we bring in the minus sign, we get
\[\large (-2n+(-9)) +7n+(+6)\]

Answer 18

Or simply
\[\large (-2n+(-9)) \color{blue}{+7n+6}\]
and isn't that better? :D

Answer 19

I feel baptized. :D

Answer 20

Now, what about these?
\[\large\color{green}{ (−2n+(−9))}+7n+6\]

Answer 21

THOSE ARE A PAIN IN THE ARSE

Answer 22

Well, there actually is no need for the outside parentheses, since there is no minus-sign outside

Answer 23

Agreeing with me that
\[\large (a+b) = a+b\]? :D

Answer 24

Uh hu uh hu :3

Answer 25

Since there was nothing outside of them parentheses, we can just remove THAT pair, giving us...
\[\large −2n+(−9)+7n+6\]

Answer 26

So there's only one bloody pair of parentheses now...
\[\large−2n\color{red}{+(−9)}+7n+6\]

Answer 27

idk why they torture me so D:

Answer 28

Well, this one shouldn't be that hard...parentheses usually imply multiplication, yeah?

Answer 29

so, when you see this...
\[\large −2n\boxed{\color{red}+(\color{blue}−}9)+7n+6\]
+ ( -
It's also multiplying the signs :)
So, whats + times - ?

Answer 30

A negative? Its NEGATIVE

Answer 31

Yup :)
\[\Large −2n−9+7n+6\]
And that's it, all that's left is to simplify. :)

Feel better?
^_^

Answer 32

ALOT

Answer 33

Good :)
I'm confident the problem no longer poses a threat to your sanity at this point :D

Answer 34

5n+(-3) I hate this format :c BUT ITS RIGHT

Answer 35

5n - 3 is much better, no? :)

Answer 36

It is, but multiple choice its plus a negative xD

Answer 37

fACK LOGIC :C

Answer 38

We're here to abide by their silly rules :3

Answer 39

Thank you so much :)

Answer 40

No problem :)