(y+3)²(y-3)²等于几（过程也要）急!

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(y+3)²(y-3)²等于几（过程也要）急!
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(y+3)²(y-3)²等于几（过程也要）急!
(y+3)²(y-3)²等于几（过程也要）急!

(y+3)²(y-3)²等于几（过程也要）急!
(y+3)²(y-3)²
=[(y+3)(y-3)]²
=(y²-9)²
=y^4-18y²+81