Question

expressions that are equivalent to 9x^4 - y^2

Answer 1

a^2-b^2 = (a-b)(a+b)
so for example
( 3 x^2 - y) (3 x^2 + y)

Answer 2

l

Answer 3

I'm sorry, could you please clarify your question or provide more information for me to assist you better?