The distributive property
For this case we have the following polynomial:
![x ^ 4 + 8x ^ 2 - 9](https://tex.z-dn.net/?f=%20x%20%5E%204%20%2B%208x%20%5E%202%20-%209%20%20)
We make the following change of variables:
![u = x ^ 2](https://tex.z-dn.net/?f=%20u%20%3D%20x%20%5E%202%20%20)
Rewriting we have
![u ^ 2 + 8u - 9](https://tex.z-dn.net/?f=%20u%20%5E%202%20%2B%208u%20-%209%20%20)
Factoring the second order polynomial we have:
![(u + 9) (u-1)](https://tex.z-dn.net/?f=%20%28u%20%2B%209%29%20%28u-1%29%20%20)
Then, returning the change we have:
![(x ^ 2 + 9) (x ^ 2-1)](https://tex.z-dn.net/?f=%20%28x%20%5E%202%20%2B%209%29%20%28x%20%5E%202-1%29%20%20)
Finally, we factor the expression in the parentheses of the second term:
![(x ^ 2 + 9) (x + 1) (x-1)](https://tex.z-dn.net/?f=%20%28x%20%5E%202%20%2B%209%29%20%28x%20%2B%201%29%20%28x-1%29%20%20)
Answer:
the completely factored form is:
![(x ^ 2 + 9) (x + 1) (x-1)](https://tex.z-dn.net/?f=%20%28x%20%5E%202%20%2B%209%29%20%28x%20%2B%201%29%20%28x-1%29%20)
I think it’s Arrhenius acid I’m not so sure
Side of the square computer screen = 21 inches
It is important to minutely read the details that are already given in the question. the most important information that is given in the question is that the computer screen ia square. Based on this information the answer to the question can be easily deduced.
Then
Area of the computer screen = (Side)^2
= (21)^2 inches square
= 441 inches^2
So the area of the square computer screen is 441 square inches. i hope the procedure is clear enough for you to understand.
What is the question you are asking and no one is gonna know what lesson 3.2 means.