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Mathematics 14 Online
OpenStudy (anonymous):

x-(12-x)=38

myininaya (myininaya):

Distribute the negative like x-12+x=38

myininaya (myininaya):

like terms 2x-12=38

OpenStudy (anonymous):

My math teacher wants us to show each step and Im confused

myininaya (myininaya):

add 12 to both sides: 2x=38+12

myininaya (myininaya):

2x=50

OpenStudy (anonymous):

then you divide

myininaya (myininaya):

Now divide both sides by 2: x=50/2=25

OpenStudy (anonymous):

Oh! Thankyou

myininaya (myininaya):

That's all. You not confused about any of the steps?

OpenStudy (anonymous):

Actually i am

myininaya (myininaya):

Where do you get stuck?

OpenStudy (anonymous):

The first

myininaya (myininaya):

So you know subtraction can be turned into addition right?

myininaya (myininaya):

3-5=3+(-5)

OpenStudy (anonymous):

Mhm

OpenStudy (anonymous):

yea

OpenStudy (anonymous):

but isnt it distributive property

myininaya (myininaya):

So we have 12+-(12-x)=38

myininaya (myininaya):

that - in front of that paranthesis can be read at -1

myininaya (myininaya):

so what is -1(12-x)?

OpenStudy (anonymous):

Huh??!!! you totaly confused

myininaya (myininaya):

the changing subtraction to addition?

OpenStudy (anonymous):

because for example she said to do multiplication during distributive property 3(12+9)

myininaya (myininaya):

Right

OpenStudy (anonymous):

(3*12)+(3*9)

myininaya (myininaya):

yes so what is -1(12-x)

OpenStudy (anonymous):

(-1*12)-(-1*x)

myininaya (myininaya):

yes which =-12+x

OpenStudy (anonymous):

yeeees

myininaya (myininaya):

now we have x+(-12+x)=38

OpenStudy (anonymous):

why do you have to change the sub sign

myininaya (myininaya):

since addition is commutative and associative we have x+x-12=38

OpenStudy (anonymous):

cant you just put 12x?

myininaya (myininaya):

?

myininaya (myininaya):

x+x=2x

myininaya (myininaya):

so we have 2x-12=38

OpenStudy (anonymous):

then i know

myininaya (myininaya):

+12 on both sides giving us 2x=50 then divide both sides by 2

OpenStudy (anonymous):

from here

myininaya (myininaya):

ok

OpenStudy (anonymous):

ohhhhhh i get it!!

OpenStudy (anonymous):

i <3 you thankyou!!!!!!!11

myininaya (myininaya):

:)

OpenStudy (anonymous):

have an awesome day

myininaya (myininaya):

i finished it? That's all you needed? lol

myininaya (myininaya):

ok no worries lets just find your mistake

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