Question

is it A?
Find the product of (x + 3)(x − 3).

x2 − 6x + 9

x2 + 6x + 9

x2 + 9

x2 − 9

Answer 1

use the difference of squares rule

Answer 2

I have a problem with the adding and subtracting

Answer 3

the difference of squares rule is

(a+b)(a-b) = a^2 - b^2

Answer 4

does that help?

Answer 5

yess thank you! so its A?

Answer 6

no it's not A,use the template I gave you

Answer 7

its B

Answer 8

similar example

(x-5)(x+5) = x^2 - 5^2

(x-5)(x+5) = x^2 - 25

Answer 9

do you know the FOIL method ?

Answer 10

yeah I did it its B

Answer 11

it's not B either

Answer 12

your just guessing....work it out.
Do you know the FOIL method or you can just do it the way jim showed you

Answer 13

do you want some help ?

Answer 14

I am not going to participate unless you participate

Answer 15

yes please, I will

Answer 16

do you see how my example works ?

Answer 17

yeah

Answer 18

so in the case of the example

a = x
b = 5

and they are plugged into (a+b)(a-b) = a^2 - b^2

Answer 19

so x^2-5^2

Answer 20

correct, then 5^2 turns into 25

Answer 21

so that's how I got (x-5)(x+5) = x^2 - 25

Answer 22

jim...this doesn't work on all problems, should I show her the FOIL method or do you thin that will confuse her

Answer 23

so x^2+10x+25

Answer 24

typo * think

Answer 25

go ahead

I figured that the short and easy way works just as well

Answer 26

x^2+10+25x?

Answer 27

but you can go the FOIL route if you want

Answer 28

ok.....I like this way
FOIL
it stands for (first, outside, inside, last.
(x + 3)(x - 3)
F - multiply the first terms in each set....x * x = x^2
you can do the rest
O - multiply the outside terms in each set...x * -3 = ?
I - multiply the inside terms in each set...3 * x = ?
L - multiply the last terms in each set...3 * -3 = ?
Can you understand what I am doing ?

Answer 29

yes but brb I gotta go to the store real quick

Answer 30

tag me when you get back and we can finish

Answer 31

@texaschic101

Answer 32

I am here....shall we finish...can you answer the last questions I posted ?

Answer 33

x^2-9x-9

Answer 34

not quite...don't guess....lets do this
we are on the outside terms
O - multiply the outside terms in each set...x * -3 = ?

Answer 35

-3x

Answer 36

correct....now the inside terms...3 * x = ?

Answer 37

3x

Answer 38

correct....now the last terms in each set...3 * -3 = ?

Answer 39

-9

Answer 40

Now we will put all our answers together...
x^2 - 3x + 3x - 9
now we can combine like terms
can you do that ?

Answer 41

yes so its x^2+9x-9

Answer 42

no....look at your -3x and 3x....they are opposites so they cancel each other out leaving us with x^2 - 9
Do you understand ?

Answer 43

ohhhh, yeah now I understand lol

Answer 44

thats good....Just remember FOIL....first,outside,inside,last....it will come easier once you learn it....

Answer 45

I think I'm getting it now, thank you so much!

Answer 46

your very welcome...glad I could help :)