Question

solve -2x - 2 (-7x + 7) = 82

Answer 1

okay so you see that -2 on the outside of the ( ) ?

Answer 2

yes

Answer 3

we have to distribute that -2 in the inside so that means we multiply -2 by everything in the ( )

so for this part here's what we have

\[-2(-7x+7) = 14x-14\]

Answer 4

ok I'm following

Answer 5

now so the next step is here is what we have

-2x-14x-14 = 82

we've got to combine like terms, how do you think we would do this?

Answer 6

-16x - 14 = 82

Answer 7

yes now we can easily isolate x. what's our next step?

Answer 8

add 14 to both sides

Answer 9

yes

Answer 10

so now we've got -16x = 96

Answer 11

x = -6

Answer 12

and that's all it is. the most important thing was to distribute the negative sign outside of the ( )

Answer 13

thanks! i have another question about something else

Answer 14

ok

Answer 15

how do you put square root in a calculator?

Answer 16

well you do two things: you can take your number and put ( ) around it
and raise it to the 1/2 power (n)^{0.5}

Answer 17

or you can press the sqrt button

Answer 18

\[\sqrt{n} = (n)^{\frac{ 1 }{ 2 }}\]

Answer 19

i'm trying to find that on my calculator

Answer 20

the sqrt button

Answer 21

i don't see it

Answer 22

i have a TI-84 Plus

Answer 23

okay so you see this button

\[x^{2}\]

Answer 24

yes

Answer 25

press the second button then \[x^{2}\]

Answer 26

ok

Answer 27

\[second \rightarrow x^{2}\]

Answer 28

omg how did you know that? thanks so much!!!

Answer 29

When I was in HS i used a T183

Answer 30

same thing but less advanced

Answer 31

omg that was so helpful. so how do i approximate the square root of 13 to the nearest tenth

Answer 32

that i'm not sure about

Answer 33

usually I just round it in my head when the answer comes out

Answer 34

oh ok