因式分解(a²+9b²)²-36a²b²

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因式分解(a²+9b²)²-36a²b²

原式
=(a²+9b²)²-(6ab)²
=(a²+9b²+6ab)(a²+9b²-6ab)
=(a+3b)²(a-3b)²

( a" + 9b" )" - 36a"b"
= ( a" + 9b" )" - ( 6ab )"
= ( a" - 6ab + 9b" )( a" + 6ab + 9b" )
= ( a - 3b )"( a + 3b )"