Question

i need some one to show me step by step how to do this /4c-2/, c= -3 it's Absolute value

Answer 1

plug in -3 for c, what do you get?

Answer 2

let me see :)

Answer 3

-14
?

Answer 4

is that right ?

Answer 5

right, the value of the expression inside the absolute value is -14. But, what does absolute value mean?

Answer 6

examples of absolute value

|x|=x
|-z|=z

|100|=100
|-345|=345

etc etc etc

Answer 7

i'm sorry an you explain more

Answer 8

Do you know the definition of absolute value?

Answer 9

i'm sorry i don't

Answer 10

:(

Answer 11

Absolute value is the numerical value of a number without considering the positive or negative sign. So, the absolute value of 10 is 10. The absolute value of -2 is 2. It is just the value of the number. It is always positive.

Answer 12

o ok so the "-3" is just a 3 and not a "-3 " so the answer would be 14

Answer 13

You are half right...

Answer 14

Let's back up...

Answer 15

"-3" is still -3. That doesn't change. The problem says that c = -3. So, c = -3

Answer 16

But, the problem says that you have to find /4c-2/ when c = -3

Answer 17

So, plug in -3 for c just like you did before,

/4(-3)-2/ = /-12-2/ = /-14/

So, when you plug in -3 for c, the expression equals /-14/.

But, the absolute value of -14 is 14.

Answer 18

o ok thanks man were did you get the ? /-12-/ + /-14? ?

Answer 19

Where did I get -12???

Answer 20

yeah :)

Answer 21

-12 is the product of 4 and -3

Answer 22

When you plug in -3 for c, you multiply 4 x -3

Answer 23

o i see now wow xD thanks man for all of your help

Answer 24

You're welcome. If you have time, try these to make sure you know how to do absolute values:

Find /4c-2/ when c = 3
Find 4/c/-2 when c = -3
Find 4c - /-2/ when c = -3

Answer 25

ok awesome man thanks i will do :)

Answer 26

|4c - 2|

Do you know how to use the shift button @teic85?

Answer 27

No, how does that work?

Answer 28

Hold down the shift button when pressing the \ key

Answer 29

Oh I see, I was simply using the same notation as "sup"

Answer 30

Thanks for pointing that out, though :)

Answer 31

Hold down the shift button when trying to post || absolute value symbols

Answer 32

Like this?

|4c-2|

Answer 33

Precisely

Answer 34

Thanks!

Answer 35

Isn't there a keyboard shortcut for superscript too? Might come in handy for exponents

Answer 36

i am stuck on this one -/-10-z,/z
=-3

Answer 37

:(

Answer 38

i got 30

Answer 39

but i think it is wrong

Answer 40

Ok, rewrite the expression after plugging in z = -3

Answer 41

Also, use |, it's the key above the enter key. You must use the shift key

Answer 42

-/10 (-3)/
like that ??

Answer 43

Nope, you are using /. Press shift and \

Answer 44

lol you're teaching people already @teic85

Answer 45

And no, the expression is missing a minus

Answer 46

i no clue what the shift thing is lol xD

Answer 47

lol yes @Hero, that's the purpose of Open Study right? :D

Answer 48

*have

Answer 49

xD

Answer 50

:D

Answer 51

haha ok, @Sup_open~study . Let's focus on the problem first.

Answer 52

i think i am so post to - it and not x it ?

Answer 53

Correct, you have to subtract z not multiply
You wrote -/10 (-3)/
The original expression is -|-10-z|

Answer 54

Be careful, you also missed the negative in front of the 10

Answer 55

o i see yeah i was writing it wrong xD

Answer 56

Rewrite the expression after plugging in -3 for z

Answer 57

-/-10-3/ = 13 ?

Answer 58

z = -3, but the expression is -10 MINUS z.

So, it should be -10 - (-3) which is actually -10 + 3

Answer 59

so it's 7 ??

Answer 60

What is 7?

You are jumping ahead... :)

Answer 61

sorry xD

Answer 62

haha it's ok :)

Answer 63

When you plug in -3 for z, you get:

-|-10 - (-3)|

Answer 64

That look about right to you?

Answer 65

yeah thanks :)

Answer 66

Ok, so we know that minus -3 is actually +3. So rewrite the entire expression with +3 in that spot

Answer 67

ok so it's -|-10 - (3)|

Answer 68

?

Answer 69

Not quite,

Minus -3 is +3. So, it is -|-10+3|

Answer 70

a negative and a negative make a positive

Answer 71

o i see but how would i solve that ??

Answer 72

ok, well now that that pesky z is gone, we can just focus on what is inside the absolute value. What is -10 + 3?

Answer 73

- 7 so it's just 7 ?

Answer 74

The absolute value of -7 is 7. Yes.

Answer 75

o ok i see now but on the answer for the study guide he put -7 why not 7 ??

Answer 76

What's in front of the absolute value?

Answer 77

i can't tell what you are looking for sorry but he had like a -1 -10 + -7 ?

Answer 78

This is the expression:

-|-10+3|. What is in front of the absolute value?

Answer 79

a negative

Answer 80

?

Answer 81

Right

Answer 82

So look at this...

|-7| = 7

What is -|-7| ?

Answer 83

-7

Answer 84

?

Answer 85

Since the negative sign is in front, it makes the expression negative. So -7 is the answer.

Answer 86

-|-7| is different than |-7|

Answer 87

o so it's just 7

Answer 88

No, it isn't just 7.

Answer 89

The expression in your problem has a negative in front like this,

-|-7|

Answer 90

yes

Answer 91

So, the absolute value of -7 is 7. But, then you have to add the final negative (the one in front). So, it's -7

Answer 92

ok so when you have the - in front of the problem the answer is most likely going to be a - ???

Answer 93

Don't think "most likely". You'll get the wrong answer. That's just guessing.

Answer 94

Think about this...

what is -2(1 + 3) ?

Answer 95

-8

Answer 96

Right. The negative in front changes it to negative. So, when you have a positive number times a negative number you get a negative.

Answer 97

o i see so when you change the answer to positive the negative will times it and that will make it an negative ?