Answer:
16
Step-by-step explanation:
x=2. y=4
following bodmas
2*4=8
I would say B .
They are not like terms because they are not all the same
Simplify both sides of the equation
Subtract 2 from both sides
Divide both sides by 5


OR

3x^-2 can be written
3/x^2 because x^-2 is = 1/x^2