a ki power four -5akipowertwo-36
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a^4 - 5a^2 - 36
= a^4 - 9a^2 + 4a^2 - 36
= a^2 ( a^2 - 9 ) + 4 ( a^2 - 9)
= (a^2 - 9) ( a^2 + 4)
= (a^2+4)(a+3)(a-3)
= a^4 - 9a^2 + 4a^2 - 36
= a^2 ( a^2 - 9 ) + 4 ( a^2 - 9)
= (a^2 - 9) ( a^2 + 4)
= (a^2+4)(a+3)(a-3)
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