Please make the questions more clear
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ANSWER
See below
EXPLANATION
We want to verify that,

To verify this identity, we can take the left hand side simplify it to get the right hand side or vice versa.





We now expand the right hand side to get:

Answer:
it's -4 I just took the test and you will get it write
Answer:
a=15
Step-by-step explanation:

Hope it helps
Answer:
b
Step-by-step explanation: