Answer:
d=1
Step-by-step explanation:
Factor d^2 - 2d - 8 into (d-4)(d+2)
Move -2/d+2 onto the other side, changing it into 2/d+2.

Let the empty side equal zero.
Add 3/d-4 and 2/d+2

Then add that to -3d.

Multiply 0 by d+2 and d-4 to get 2d-2 by itself.
2d=2
d=1
I can't edit the equation, but it's d-4 althroughout the question. Sorry for being so slow.
Answer:
150 units^2
Step-by-step explanation:
A cube has all equal sides. This one has five units for every side.
There are 6 faces here, and 4 vertices for every face.
The equation would look like this 6 x side^2.
Which would also equal to 6 x 5^2.
If you do this, you will find that the answer is 150 units^2.