Question

Evaluate the expression, using the given value of the variable.

2 – 8x + 3x when x = 5

A.
–53

B.
–23

C.
–15

D.57

Answer 1

substitute x for its value

Answer 2

the value for x is 5

Answer 3

right so replace x with 5

Answer 4

i did

Answer 5

show me what did yo uget after replacing x with 5

Answer 6

2 - 8x + 3x
x = 5
2 - 8(5) + 3(5) =
2 - 40 + 15 =
- 40 + 17 = - 23. (Correct answer B.)

Answer 7

i did two thing's i did 2 – 85 + 35=-48
and i did 2 – 8.5 + 3.5=4

Answer 8

did u look at wht i posted @cmtboy2

Answer 9

ya

Answer 10

it's 8x `8 times x`
so you should multiply the 8 with x value put the parentheses

Answer 11

therefore the answer is B.

Answer 12

no

Answer 13

no wht

Answer 14

not you @dakid88

Answer 15

so when you replace x for 5 that's how you should write
2-8(5)+3(5) and remember the PEMDAS rule

Answer 16

oh

Answer 17

oh that i diden't do

Answer 18

Evaluate the expression, using the given value of the variable.

z ÷ 4 – 8z + 2(z – 5) when z = 12

A.
–79

B.
–74

C.
–34

D.
107

Answer 19

same here right

Answer 20

z ÷ 4 – 8z + 2(z – 5)
(12)÷4-8(12) +2((12) -5)
=-74

Answer 21

stop giving out answer plz

Answer 22

nope im helping him at the same times

Answer 23

let him/her learn its not ur knowledge test

Answer 24

there is no learning process when u provide the answer as well

Answer 25

im a boy thank you

Answer 26

lol

Answer 27

like i said im helping him at the same time @Nnesha thank u

Answer 28

don't you see cmtBOY2

Answer 29

there is a difference between helping and enabling

Answer 30

leace me alone were most focus on helping @cmtboy2

Answer 31

a girl can use boy word for username

Answer 32

ok but im a boy

Answer 33

how do you do this

Answer 34

At least try it @cmtboy2, it's the same thing as before. Substitute your variable for your value then simplify.

Answer 35

hey nnesha not cool dude if the guy is a guy cool if ntot cool just live with it kay:)

Answer 36

did you understand first question ? if you did then you shouldn't ask that question
PEMDAS thats what ur teacher wants u to learn

Answer 37

idc if its guy or girl doesn't matter there is a reason i said /him/her
its not important to know the gender

Answer 38

@broski532, you literally added nothing to this discussion. If you're not going to help with the question, don't bother answering.

Answer 39

be nice @tom982

Answer 40

You're joking, right? @Nnesha was doing a great job helping and @broski532 comes in making an issue out of nothing. We're here to help you guys understand maths, not cause unnecessary drama or just post answers.

Answer 41

am i adding (4)-2 to 12/(4)

Answer 42

nice \[\frac{ 12-4 }{ 12 \div 4 }\]

Answer 43

so i figer them out frist then i add them

Answer 44

2+3

Answer 45

what do you mean *figure them*
PEMDAS
P) parentheses first
E)exponent
3rd MD ) multiply or divide
4th) add or subtract
start with the first step is there any parentheses ? no move to the 2nd step is there any exponent ? if no then 3rd step is divide or multiply

Answer 46

nvm there is typo

Answer 47

\(\color{blue}{\text{Originally Posted by}}\) @Nnesha
nice \[\frac{ 12-4 }{ 12 \div 4 }\]
\(\color{blue}{\text{End of Quote}}\)
i meant \[\frac{ -4-2}{ 12 \div- 4 }\] k value is negative

Answer 48

-4-2=6

Answer 49

12/-4=-3

Answer 50

so now we add (-3) to 6

Answer 51

when the sign are the same of both numbers you should just simply add them together and then keep the same sign

Answer 52

-4-2= ?

Answer 53

-6

Answer 54

correct \[\frac{ \color{Red}{-4-2 }}{\color{blue}{ 12 \div -4 }}=\frac{\color{reD}{ -6 }}{ \color{blue}{-3} }\] now just simplify that

Answer 55

now add -6 to -3

Answer 56

it's not -6 `+`(-3)
fraction = division

Answer 57

soo divide -3 to -6 right

Answer 58

\[\rm \frac{ \top op }{bottom }\]

top part divided by the bottom
-3/-6 isn't the same as -6/-3

Answer 59

ok thank

Answer 60

z ÷ 4 – 8z + 2(z – 5) when z = 12
Answer is not -74