9a^2-(a^2-4)^2 factories it
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Answer:
(a^2-4)^2=a^4-8a^2+16
9a^2-(a^4-8a^2+16)
9a^2-a^4+8a^2-16
-a^4+17a^2-16
rakshittandon:
it's wrong but thanks
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