Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing
Inopeki
Group Title
FOILing, do i multiply or add?
Like (2x+4)+(2x+4)
i add there, right? And
(2x+4)*(2x+4)
I multiply there, right?
 2 years ago
 2 years ago
Inopeki Group Title
FOILing, do i multiply or add? Like (2x+4)+(2x+4) i add there, right? And (2x+4)*(2x+4) I multiply there, right?
 2 years ago
 2 years ago

This Question is Closed

Inopeki Group TitleBest ResponseYou've already chosen the best response.0
I did that in class todya but i didnt get the right answer..
 2 years ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.3
what did you get for the first one?
 2 years ago

Inopeki Group TitleBest ResponseYou've already chosen the best response.0
(2x+4)+(2x+4) 4x+2x+4+4+2x+4+4 8x+16
 2 years ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.3
it looks like you are multiplying and adding instead of adding. the parentheses here are unnecessary
 2 years ago

amistre64 Group TitleBest ResponseYou've already chosen the best response.0
when it says to add, I would add. and when it says to multiply, id multiply. but thats just me set in my ways :)
 2 years ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.3
\[(2x+4)+(2x+4)=2x+4+2x+4=2x+2x+4+4\]
 2 years ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.3
let's imagine for a moment that x was ten (x is a variable, but it could be ten) then \[2x+4=2\times 10+4=24\] and \[24+24=48\]
 2 years ago

Inopeki Group TitleBest ResponseYou've already chosen the best response.0
I thought it was like this dw:1327066387934:dw
 2 years ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.3
multiplication distributes over addition. so if you had \[(2x+4)(2x+4)\] you would use the distributive law, just like if you had \[24\times 24\]
 2 years ago

Inopeki Group TitleBest ResponseYou've already chosen the best response.0
But wheres the x?
 2 years ago

Tomas.A Group TitleBest ResponseYou've already chosen the best response.0
addition is commutative you can remove brackets when you have ONLY addition
 2 years ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.3
but addition is the same as "combine like terms" just as you would with arithmetic 24 + 24 ______ 48 2x + 4 + 2x + 4 __________ 4x + 8
 2 years ago

amistre64 Group TitleBest ResponseYou've already chosen the best response.0
2x+4 (+) 2x+4  4x+ 8 2x+4 (x) 2x+4  8x+16 4xx+8x  4x^2+16x+16
 2 years ago

Inopeki Group TitleBest ResponseYou've already chosen the best response.0
Why would it be 4x^2+16x+16?
 2 years ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.3
@inopeki i was making an analogy. the work you do with variables is a generalization of the work you do in arithmetic, and if it doesn't work with arithmetic it certainly doesn't work with variables, because the variable could be a number, that is you could replace the variable by a number
 2 years ago

amistre64 Group TitleBest ResponseYou've already chosen the best response.0
becasue thats what happens when you multiply stuff
 2 years ago

Inopeki Group TitleBest ResponseYou've already chosen the best response.0
so basically just add them up?
 2 years ago

Inopeki Group TitleBest ResponseYou've already chosen the best response.0
2x+4 (+) 2x+4  4x+ 8
 2 years ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.3
imagine your job was to add \[24+24\]\ what would you do? line them up and add
 2 years ago

amistre64 Group TitleBest ResponseYou've already chosen the best response.0
5+3 = 8 (x) 2+4 = 6  20+12 10+6  10+26+12 = 48
 2 years ago

Inopeki Group TitleBest ResponseYou've already chosen the best response.0
24 +24  48
 2 years ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.3
and similarly 2x + 4 + 2x + 4 __________ 4x + 8
 2 years ago

Inopeki Group TitleBest ResponseYou've already chosen the best response.0
Oh! Give me another example?
 2 years ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.3
\[(3x+5)+(4x+1)\]
 2 years ago

Inopeki Group TitleBest ResponseYou've already chosen the best response.0
(3x+5) +(4x+1)  7x+6
 2 years ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.3
that's it!
 2 years ago

Inopeki Group TitleBest ResponseYou've already chosen the best response.0
Yes! :D Thanks
 2 years ago
See more questions >>>
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.