Answer:
b
Step-by-step explanation:
Answer: x=9
Step-by-step explanation:
7x=2x+45
5x=45
x=9
Answer:
C) 960
Step-by-step explanation:
Let's expand the factorial.
n! = 1*2*3*4*...n
6! = 1*2*3*4*5*6
3!= 1*2*3
The given expression 
= 
Canceling out the common terms, we get
= 
= 8.4.5.6 [here . represents multiplication]
= 960
Answer: C) 960
Thank you.
ANSWER

EXPLANATION
The given expression is;

Recall that, in complex numbers

We use this identity to simplify the given expression:

This implies that:


