Question

|-4b-8|+|-1-b^2|+2b^3;b=-2

Answer 1

Help ?

Answer 2

its actually pretty easy

Answer 3

Can you explain it to me? @AllTheLonelyKillers

Answer 4

im pretty sure it is -23 but if you can check and make sure im not 100%

Answer 5

use pemdas just plug in the (b) and then solve the parentheses use what you have left in order then you can solve the full equation

Answer 6

I don't think I can use PEMDAS because it has absolute value brackets.. that is throwing me off @AllTheLonelyKillers

Answer 7

@funinabox Help?

Answer 8

oh he is good lol

Answer 9

Lol he is ! Hopefully he cn help me lol @AllTheLonelyKillers

Answer 10

what answer or how far have you gotten otonogold?

Answer 11

you can use PEMDAS, just think of the absolute value brackets like parentheses

Answer 12

i knew it

Answer 13

So it doesnt make a difference ?

Answer 14

would you combine like terms too ?

Answer 15

well, i mean it does, the absolute value brackets are not parentheses, but they are treated as such when you are using something like PEMDAS

in other words, do the things inside the brackets first, always. THEN apply the absolute value

Answer 16

|-4b-8|+|-1-b^2|+2b^3
b=-2

so plug b in, as usual

|-4(-2) - 8| + |-1 - (-2)^2| + 2(-2)^3

Answer 17

can you simplify each part down?

Answer 18

That makes soooo much more sense, I get it. thank you :)

Answer 19

what answer do you get? this problem is actually fairly tricky with the order of operations, its easy to make a mistake

Answer 20

saved the day again

Answer 21

-32

Answer 22

not quite, remember with absolute values, |-x| = x

Answer 23

so 32

Answer 24

so positive ?

Answer 25

|-4(-2) - 8| + |-1 - (-2)^2| + 2(-2)^3

first step, simplify it allllll down

|8 - 8| + |-1 - 4| + 2(-8)

Answer 26

do you see how i got from the top to bottom?

Answer 27

no, the answer isn't -32 or 32 :)

Answer 28

how did you get the -8 at the end?

Answer 29

because when you plug -2 in for b, you have (-2)^3, which is (-2)*(-2)*(-2), which is -8

Answer 30

i put the parentheses in there to make it clearer what is happening

Answer 31

oh ok i see

Answer 32

alright well, can you solve |8 - 8| + |-1 - 4| + 2(-8) then?

Answer 33

-11?

Answer 34

hold up i might be wrong

Answer 35

yes!!! good job

Answer 36

-11

Answer 37

im right? lol

Answer 38

yep both of you are correct

Answer 39

do you see why the answer is different from -32 now?

Answer 40

Thank you so much :) & Yes I do, we had to break everything down

Answer 41

yeaa
told u he was awesome

Answer 42

to recap - treat absolute value signs like parentheses first, solving everything inside of them, and then actually do the absolute value part to get rid of the brackets entirely :)

Answer 43

ok