2 answers:
Hope i understand it right
9y^2 -12y^4 = 3y^2 *(3 - 4y^2)
Answer:
is the factored form
Step-by-step explanation:

GCF of 9 and 12 is 3
GCF of variable is y^2
Take out GCF 3y^2

we cannot factor out 3-4y^2, because 3 is not a perfect square

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