16x^4-81y^4 difference of perfect squares...
(4x^2-9y^2)(4x^2+9y^2) that's one of the equivalents...
(2x+3y)(2x-3y)(4x^2+9y^2) that's another one of them...
Answer:
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2x^3+2x^2+5x-7, That would be the answer.
Answer:
-9
Step-by-step explanation: