Answer:
What do you need help with, comment
Answer:
(a) 
(b) 
Step-by-step explanation:
It is given that 
(a) We have given equation 



(b) 



Answer:
because it has two parts
Step-by-step explanation:
thats what the first one is
it equals -1
you can think of it as 7-6=1 and at the end you can just add the negative sign
Hope it helps :))