Question

Help with an Algebra 1 question for a medal?

Answer 1

Find the product of (3x + 7y)(3x - 7y)

Answer 2

have you ever heard of FOIL?

Answer 3

do you know what it stands for?

Answer 4

Sorry, no I don't.

Answer 5

okay well it stands for First, Outer, Inner, and Last

so what you want to do is multiply the first number in each parenthesis (3x and 3x which equals 6x)

Answer 6

then you do the outer (3x and -7y which equals -21xy)

Answer 7

can you do the inner and last?

Answer 8

@ImaGuest

Answer 9

Sorry, yeah I'll try.

Answer 10

Your question tells you to find the product of (3x + 7y)(3x - 7y) right?
You could use FOIL, but another way to remember that is if you break the question into two parts. What i mean is this:
We have (3x + 7y)(3x - 7y) , but you can also re-write it as the following

(3x + 7y)(3x - 7y)
= 3x ( 3x - 7y) + 7y (3x - 7y)
And then expand each part individually and collect like terms :)

Answer 11

yeah. that could work but i thought that FOIL might be the less confusing one. thank you though

Answer 12

What do you mean by inner and last by the way? Is 7y the inner and -7y the last?

Answer 13

the inner would be the two inner numbers. (7y and 3x)

Answer 14

then the last would be the last number in each parenthesis. (7y and -7y)

Answer 15

Okay

Answer 16

so all together now you have (6x - 27xy + 21xy - 49y)

Answer 17

combine the like terms

Answer 18

6x-6xy-49y ?

Answer 19

which leaves you with 6x - 6xy - 49y :)

Answer 20

yep!

Answer 21

@butterflydreamer did i do that correctly?

Answer 22

noopee

Answer 23

okay help me out then?

Answer 24

okay let's start right from the beginning.
@ImaGuest , Do you know the difference of two squares rule? :)

Answer 25

haha okay you can help him out. i tried =)