Question

simplify and evaluate please <3
-7x-3(9-7x) if x=-1
6(3x-1)-10x if x=7
7x-4(6-x)+12 if x=6
-3(4x-1)+9x+8x if x =-9
10-(2y-6)-y if y=8

Answer 1

which one do you want as an example?

Answer 2

well i need help with all since i have no clue what i am doing..

Answer 3

well they're kinda the same, you'll just have to substitute the variable in to the equation.

Answer 4

thats how you simplify ?

Answer 5

:)

Answer 6

that's how to evaluate. when you simplify, :

Answer 7

take -7x-3(9-7x) if x=-1 as an example

Answer 8

you multiple -3(9-7x) first.

Answer 9

can u do that?

Answer 10

;)

Answer 11

ya one sec. hi james.. haha

Answer 12

high

Answer 13

okay im back so its -3(2x) right??

Answer 14

?

Answer 15

http://www.wolframalpha.com

Answer 16

i dont know what im doing... hahahaa

Answer 17

you should multiply it term by term, since 9 and -7x are not like terms.

Answer 18

what the actual heck

Answer 19

thank you so much :)

Answer 20

-3(9-7x) = -3(9)+(-3)(-7x)= ? can u do the next step?

Answer 21

no cause i have no clue what the next step is

Answer 22

ok, what is -3 x9

Answer 23

-27

Answer 24

yes, what is -3(-7x)?

Answer 25

21x?

Answer 26

yes. so add them up together.

Answer 27

-6

Answer 28

or wait

Answer 29

go on

Answer 30

it would be that right? or am i wrong once again

Answer 31

remember that -27 and 21x aren't like terms

Answer 32

you are seriously helping a retard

Answer 33

don't feel that way, it should be -27+21x

Answer 34

ok, so when -3(9-7x) is -27 +21x when you put that in -7x-3(9-7x),
it should become -7x-27+21x, is that ok?

Answer 35

yea i guess but this is still confusing

Answer 36

it's ok, we can do another one later, but now let's finish up this one first.

Answer 37

okaaayy

Answer 38

in -7x-27+21x ; -7x and +21x are like terms, so what is 21x-7x ?

Answer 39

14x

Answer 40

yes, that's right

Answer 41

so what is -27+(21x-7x) ?

Answer 42

-13?

Answer 43

you should separate -27 and 14x, since -27 doesn't have a x with it they can't be combined together.

Answer 44

so it should be 14x-27 and that's it, do you grasp the idea?

Answer 45

when the term has x in it, combine them, when one has a x but the other don't separate them.

Answer 46

nope i had no clue. lol should i just copy someones homework like i usually do?

Answer 47

thanks for trying though!

Answer 48

don't copy, you can't copy in exams, here:

2x and 5x these are like terms,
2x and 7 these aren't like terms

Answer 49

i understand that part its just hard i havnt done this algebra crap in likea year.

Answer 50

it's ok, you can combine like terms, but you can't combine unlike terms, is this ok?

Answer 51

yesss mam

Answer 52

:) so if 2x+5x=7x

Answer 53

and 2x+7 = 2x+7 it stays the same since there isn't any like terms in the question.

Answer 54

that is easy enough haha

Answer 55

yes, so in -27+(21x-7x) are there any like terms and what are they?

Answer 56

21x and -7x?

Answer 57

yes, then you combine them which you get is 14x above, right?

Answer 58

yessss

Answer 59

when -27+(21x-7x) becomes -27 +14x does it have any like terms anymore?

Answer 60

noooooopppee

Answer 61

yup, so the answer stays that way, correct?

Answer 62

yyeessss mam

Answer 63

and that's how you simplify your question, got it?