Question

PLEASE HELP WILL MEDAL AND FAN
I-4b - 8I+I -1 - b^2I + 2b^3 b = -2

Answer 1

@TheSmartOne

Answer 2

are those 1's?

Answer 3

l?

Answer 4

wait what

Answer 5

@TheSmartOne could probably help

Answer 6

or maybe @phi could

Answer 7

I can't make any sense of it.

Answer 8

I'm sure it's in the equation bar

Answer 9

Is it absolute value?

Answer 10

YEAh that

Answer 11

Sounds like you want to find the value of \[\Large \left|-4b-8\right| + \left|-1-b^2\right| + 2b^3\] when b = 12

Answer 12

b = 2 yes

Answer 13

I'm having trouble solving it

Answer 14

b = 2 or b = 12?

Basically, you substitute whatever value of b in to it and simplify

Answer 15

B = -2 sorry

Answer 16

Replace every copy of 'b' with -2 to get


\[\Large \left|-4b-8\right| + \left|-1-b^2\right| + 2b^3\]

\[\Large \left|-4*({\color{red}{b}})-8\right| + \left|-1-({\color{red}{b}})^2\right| + 2({\color{red}{b}})^3\]

\[\Large \left|-4*({\color{red}{-2}})-8\right| + \left|-1-({\color{red}{-2}})^2\right| + 2({\color{red}{-2}})^3\]

Do you see how to finish?

Answer 17

b=-2
\[\left| -4 \times- 2-8 \right|+\left| -1-(-2)^2 \right|+2\left(- 2 \right)^3=?\]

Answer 18

I think so.. Do I multiply -4 and -2 then subtract eight etc..?

Answer 19

yes you would follow PEMDAS

Answer 20

Okay, so -4 * -2 = 8 - 8 = 0?
then -1 - -2^2 = 4
then 2(-2)^3 = -16
idk if I did that right

Answer 21

The part `-1 - -2^2 = 4` is incorrect

Answer 22

the first and third parts are correct

Answer 23

Okay that's -5 then?

Answer 24

yes. Then you take the absolute value

\[\Large \left|-1-(-2)^2\right| = \left|-1-(4)\right|\]
\[\Large \left|-1-(-2)^2\right| = \left|-1-4\right|\]
\[\Large \left|-1-(-2)^2\right| = \left|-5\right|\]
\[\Large \left|-1-(-2)^2\right| = 5\]

Answer 25

So
\[\Large {\color{red}{\left|-4*(-2)-8\right|}} + {\color{blue}{\left|-1-(-2)^2\right|}} + {\color{green}{2(-2)^3}}\]
turns into
\[\Large {\color{red}{0}} + {\color{blue}{5}} + ({\color{green}{-16}})\]

Answer 26

Do we solve the last part, and that's the solution?

Answer 27

you simplify it to get what?

Answer 28

-11

Answer 29

Correct. -11 is the final answer

Answer 30

Oh that makes sense. Thanks so much

Answer 31

no problem