Answer:
n = - 
Step-by-step explanation:
Given
- 8n = 13 ( divide both sides by - 8 )
n =
= - 
You know

Squaring both sides gives

Then raising both sides to any integer power
gives

That is, any power of
where the power is a multiple of 4 will always be equal to 1.
So

But perhaps you mean to write 20+1 as the exponent, in which case

Answer:
-18x^2 -54x + 72
Step-by-step explanation:
A) corresponding angle theorem