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ok

graph?

Nope, did not come with one :(

the first one. Im not that sure tho

yup, the first 1

What made you choose the first one?

Is he correct?

what does x*(7x-2) simplify to?

7x^2 - 2x

how about (x+3)^2 ?

x^2 + 9?

nope

close though

you have to FOIL

\[\Large (a+b)^2 \neq a^2 + b^2\]

\[\Large (a+b)^2 = (a+b)*(a+b)\]
then FOIL

I never understood how to use FOIL :(

why not try a table then

|dw:1434587606302:dw|

fill out the table by multiplying the headers
eg: x times 3 = 3x
|dw:1434587643368:dw|

Ooh, this method is completely new to me. So would the top left be x^2?

yes since x times x = x^2
|dw:1434587719782:dw|

And the bottom left would be 3x

yep
|dw:1434587746108:dw|

Alright, so what next?

we fill out the last box
3 times 3 = 9
|dw:1434587803197:dw|

Oh you do that side too??

then we add up all of the expressions inside the table
|dw:1434587822641:dw|

Well, box I mean. Haha, sorry about that

yeah the entire table needs to be filled out

So x^2 + 6x + 9

very good

so (x+3)^2 = x^2 + 6x + 9

now add 7x^2 - 2x and x^2 + 6x + 9 to get your answer

8x^2 + 5x + 9?

close

What did I do wrong? Am I supposed to add the exponents? Or...?

line up the terms and add straight down
|dw:1434587769859:dw|

the exponents stay the same

\[\Large 7x^2 + x^2 = 8x^2\]
\[\Large 7x^2 + x^2 \neq 8x^4\]

OH MY GOD I FEEL SO STUPID

I messed up simple subtraction...

don't beat yourself up, it's fine

7x^2 + 4x + 9. Sorry about that :D

8x^2 + 4x + 9*

looks good
|dw:1434588029526:dw|

Alright, so what do we do from here?

the problem is done now

no problem