math help

[racergirl13]

can someone show me how to do these?

a) (5x - 7)(2x - 3)(x + 2)

b) (p + q)(p^2 - pq + q^2)

c) (p - q)(p^2 + pq + q^2)

[ProspectorJim]

what are you even trying to do here?

[racergirl13]

multiply

p^2 means to the power of 2. or squared.

[fastredrider44]

I can tell you the answers, but showing the work is the problem.

[racergirl13]

i have the answers but i don't know how to get them. I have to show my work :(

[fastredrider44]

What class is this for?

[racergirl13]

math 070. an algebra class at the community college I go to.

[XCRacer236]

Originally posted by racergirl13
can someone show me how to do these?

a) (5x - 7)(2x - 3)(x + 2)

b) (p + q)(p^2 - pq + q^2)

c) (p - q)(p^2 + pq + q^2)

dont you just distribute to each one? like the 5x to the 2x and then -3 and the x and then the 2 all separate? then same for -7?

[250r rider 88]

FOIL method, when you have three sets like that, FOIL 2 of them, get that answered then take the final set, like in b and c, and take each term times each term in the longer set

[Tommy Warren]

:huh :huh :huh :huh :huh :huh :huh :huh :huh :huh :huh :huh :huh

[JParisi48]

FOIL first outer inner last, solve the problem in those steps, if you really dont know how to do anything then, i dont know how to explain it...

[Sjorge450R]

how'd you get the answer without working through it? These are the type of problems that require you to show your work. Just foil it out and thats it.

[ZeroLogic]

We're goin off of what I remeber from highschool so I hope this is right.

a) (5x - 7)(2x - 3)(x + 2)

5x times 2x=10x
10x times x=10x
-7x-3=21
21+2=23

(10x+23)


On a side note, kinda weird to me but you got the same birthday as me and you live in the same town I want to move to. Call me weird.:p

[Ralph]

You can check your answers with wolframalpha.com

[Sjorge450R]

great site Ralph!!! Where was it all my life!!! Its definetly going to help me with homework. I HATE! not being able to check even answer problems and my terrible professors love giving them as homework!

[Ralph]

Haha, yeah that site is pretty cool. Its kind of a useless nerd search engine. Try typing in your birthday.

anyway, here is number 2. I know I am just giving you the solution but I learned this kinda stuff by example.

Plus, you still gotta do number 3... :)

[Sjorge450R]

hahaha the birthday thing is pretty cool too.

As like you Ralph, I am a sucker for this, being that I am a mathematics major... Sometimes i wonder why i am, but other times I just yell uncontrollably about sequences and such.

[fastredrider44]

Originally posted by ZeroLogic


On a side note, kinda weird to me but you got the same birthday as me and you live in the same town I want to move to. Call me weird.:p

Stalker!:huh

[racergirl13]

thank you guys for your help!!! made a 96 on my test. :)

great site Ralph! thanks!

and zeroLogic: that is very weird! :)