Question

Simplify 13x - 4[x + (3 - x)].

Answer 1

13x - 12
9x - 1
8x - 12

Answer 2

Simplify each bracket--> remove 'em beginning with the innermost bracket-

13x - 4[x + 3 -x]

'x' and '-x' add up to zilch..

so,
13x - 4(3)
= ??

Answer 3

9x-1

Answer 4

How in this whole holy earth does "13x minus 4 times 3" equal '9x-1'?? That is some sorcery! -_-

Answer 5

ok sorry

Answer 6

1 - you mean option#1?

Answer 7

ya

Answer 8

Then, Jajaja! - Thou art correct. Only if you understand this, ofcourse. -.-

Answer 9

i kinda do

Answer 10

Okay let's see what you understood of this:

What's: x + [2x -3] ?

Answer 11

2x^2-3?

Answer 12

x^2??? O.O

Okay okay, seems like we have some serious clearing up to do here - ahaa!


how will you open the brackets in this case? can you just type out the working? This is 'PLUS' sign - not a 'multiply'.

Answer 13

okaayyy

Answer 14

So so - what 'okay' eh? The thingy opens like this:

x + 2x - 3
= ??

thee knoweth addition?

Answer 15

ok i get it im dumb

Answer 16

nah you no dumb.

x +2x = what? just tell me this much.

Answer 17

3x

Answer 18

very good!!

now you just need to subtract a '-3' form it. so algebraically, that's simply "3x-3". that's it!

Answer 19

get this much?

Answer 20

yup

Answer 21

its 13x-12 :)

Answer 22

ya i know

Answer 23

Okay one last one - a very easy one:

what if there's a minus sign in the question:

x-(2x-3) ---> how would you work in this case? show your working (jus' a couple of steps).

Answer 24

x-3

Answer 25

?

Answer 26

umm umm - almost there..... hmm :)

x -(2x -3)

now there is a 'minus' sign beside the bracket - so that '-' combines with '+2x' inside the bracket, and makes it '-2x', as well as combines with that '-3' inside the bracket, and makes it a '+3' when it opens up. so, when you remove the brackets, you get something like:

x - 2x + 3

so what would this^ be?

Answer 27

x+3

Answer 28

umm umm umm - still one tiny problem-

x - 2x = what??

Answer 29

-x?

Answer 30

yeah!!

so -x added to 3 --> whazzat?

Answer 31

just like the previous one - you can't add two unlike things, so you let them remain in (something + some*x) form

Answer 32

-x+3

Answer 33

Yeah!! you got that aha!!

so want some more fun practice? :P ( I am guessing the answer will be a big 'NO' :P)

Answer 34

ur right

Answer 35

NOOO!!!

Answer 36

Haha okay!!! Lol

Just stay calm and cool - math ain't that big a monster as it seems (in fact it's no monster at all). it's just the fear. Kill it before it kills you ;)