Question

Multiply and simplify: (3 + √3) (5 - 4√3)

Answers:
3
15-4√3
3-7√3

Answer 1

Just FOIL type multiplication. Just like with 2 binomials. Then simplify each term, combine the like terms.

Answer 2

wouldn't it be B? O_o

Answer 3

actually no, I think its A according to the foil

Answer 4

What do you get for the 4 terms of the FOIL?

Answer 5

am i right?

Answer 6

Don't worry about the answer choices. What do you get for the 4 terms of the FOIL?

Answer 7

wait i multiply all of them?

Answer 8

it's just like foil:

(a+b)(c+d)=ac+ad+bc+bd

Answer 9

okay, now I'm totally lost :/

Answer 10

why? do you know what "FOIL" is? how to multiply 2 binomials?

Answer 11

i guess not

Answer 12

If you prefer, you can think of it as distribution. Same thing:

(a+b)(c+d)=a(c+d) + b(c+d)
=ac +ad +bc +bd

That works, right? you know how to distribute?

Answer 13

Do it that way.

Answer 14

@sara17 stop giving answers please.
OpenStudy values the Learning process - not the ‘Give you an answer’ process.
Don’t post only answers - guide the asker to a solution.
http://openstudy.com/code-of-conduct

Answer 15

ok.. so sorry

Answer 16

no idea how to do any of this

Answer 17

i forgot everything

Answer 18

Are you reading what I wrote above? Use distribution:

(3 + √3) (5 - 4√3)=
3(5 - 4√3) + √3(5 - 4√3)

right? now what?

Answer 19

O_o

Answer 20

If you forgot things, then you need to do some extra work to re-learn them. Not just give up.

Answer 21

iknow i know i just that right now i only have a few days to finish my online course and i really want to pass

Answer 22

so whats the next step?

Answer 23

If you had:

3(5 - x), what would you do? You would distribute, right?
3(5 - x)=3(5) - 3x

Then, for 3(5 - 4√3) you do the same thing:

3(5 - 4√3) =3(5)-3(4√3)

That's the first half of the distribution. Do the same for the other part.

Answer 24

for this (3 + √3)

??

Answer 25

I don't see that in the problem anywhere... I meant for this:

√3(5 - 4√3)

Answer 26

you have this:
(3 + √3) (5 - 4√3)

I showed you, you distribute like this:

(3 + √3) (5 - 4√3)
= 3(5 - 4√3) + √3(5 - 4√3)

Now you distribute again, through each of those parens.... I did the first one:

(3 + √3) (5 - 4√3)
= 3(5 - 4√3) + √3(5 - 4√3)
=3(5)-3(4√3)+ √3(5 - 4√3)
^^^^^^^^^
Now you do the 2nd one ^^

Answer 27

i don't even know what the second one is! :/ forget it -.-

Answer 28

thx for trying