Question

3. Find the following product: (x - 3)(x + 3)
I think that I have found the answer to this question but can someone give me a second opinion to basically help my decision.... I am kind of stuck between two answers on it... PLEASE help me

Answer 1

Distribute or FOIL
--> x^2 + 3x -3x -9
= x^2 -9

Answer 2

I get confused on the FOIL method... can u tell me how that goes... my teacher confuses me big time with that method...

Answer 3

More in depth:
F- multiply first terms \[X x X = X^2\]
O - multipy outside terms \[X \times 3 = 3x\]
I - Inside terms \[X x -3 = -3x\]
L - Last terms \[3 x -3 = -9\]
Put that all together and you get \[X^2 -3x + 3x -9\]
when you combine like terms, that's \[X^2 -9\]

Answer 4

sorry, some of the x's are supposed to be multiplication signs, but i'm sure you can figure which.

Answer 5

lol... yea i figured that part out.... thank you for explaining that to me more in depth bc i was kind of lost there on that.... However, I had already put x^2 - 9 on my test before I asked for help or another opinion so I am happy that I got the question correct... LOL :)

Answer 6

If needed, use the box method (example in attached file)
(sorry for the bad handwriting, it's done on with a mouse.)

Answer 7

Thank you so much... never heard of that before but will take note of that definitely...