Answer:
I think it is A
Step-by-step explanation:
The equation is x=-3
a2+b2=25
or, (a+b)^2-2ab=25
or, (7)^2-2ab=25 [a+b=7]
or, 49-25=2ab
or, 24/2=an
•°• ab=12....
Answer: B 386
(7*15)*2 + (7*4)*2 + (15*4)*2
= 210+120+56
= 386
