Answer:
Step-by-step explanation:
I will translate your language and possibly help you in the comments.. Give me a moment.
we know that
A difference of squares problem can be factored as follows:

in this problem we have

Applying difference of squares

the term

substitute

therefore
<u>the answer is</u>

Step-by-step explanation:
I can't view the image .......
Answer:
Height+surface area of the bottom circles*2
Step-by-step explanation:
If the height was 3 and the surface areas of the circles were 6, you would end up with a surface area of 15