Answer:
-5 is the answer
Step-by-step explanation:
-5y2 - y2 is 0 only subtracting the y2 and the 5 stays because there's nothing to subtract it by if both -y2 - y2 equal 0 so the only thing left is -5 your answer.
so is 5y2 + y2? then is 5y4 - y2 plus 2 from 5y2 is 6y2 or 7y2
