Question

Evaluate the expression below when g = -6.
Problem:-3g - 2 -(-4g + 10)
Choices: A.
-18
B.
2
C.
30
D.
54

Answer 1

what is -6 * -4 ?

Answer 2

im not sure / :

Answer 3

what does your gut think it is?

Answer 4

-6 times -4

Answer 5

24

Answer 6

A. -18

Answer 7

24 is absolutely correct :), and what is 24 + 10?

Answer 8

34 : )

Answer 9

34 is great as well :)

now what would you say -(10) would be?

Answer 10

i should read that better;

what is -(34) is what i meant to say ...

Answer 11

uuum. . . , wait. im only an eighth grader im tenth grade classes. this stuff is confusing

Answer 12

its confusing for a little bit; but this is all very basic and doable, even for an eighth grader ... here is what you have accomplished so far:

-3g - 2 -(-4g + 10) ; replace g by -6

-3g - 2 -(-4(-6) + 10)

-3g - 2 -(24 + 10)

-3g - 2 -(34)

now lets see what -(34) would be; can we simply call this -34?

Answer 13

yes ?

Answer 14

you are correct again ... -(34) = -34

-3g -2 -34 ; so what would you say: -2-34 = ?

Answer 15

-58 ?

Answer 16

wait

Answer 17

-34
-2 when both are negative, just add and the answer is negative
----

Answer 18

-36 !

Answer 19

-36 is the better answer for that yes :)

so we have figured it all the way to this:

-3g - 36 ; lets replace the "g" by -6 again, since g = -6 in this case:

what is -3(-6)? which is another way to write -3 times -6

Answer 20

18

Answer 21

the answer is -18 when I followed the experssion

Answer 22

your a pro at this :)

now; 18 - 36 will give us the final answer :) what would you get?

Answer 23

gave me -18

Answer 24

yay!! ... you did it :) -18 is correct

Answer 25

As I found ahead it's -18 and no need to complictae easy things

Answer 26

!! Thank's Alot : ))

Answer 27

youre welcome :D

Answer 28

you are welcome

Answer 29

There are several concepts that need to be mastered to solve this question:

* substitution of a variable with a value
* order of operations
* dealing with addition,subtraction,multiplication of positive and negative numbers

So, when doing these problems in the beginning they need to be solved focusing on each and every step making sure they are done in the right sequence.
Later, it just becomes second nature, and you do mentally it automatically -
in fact, in some cases I tend to rush too fast through these and mess them up :)