9a4 + 8a2 + 4
= 9a4 + 12a2 + 4 − 4a2
= (3a2)2 + 2*3a*2 + 22 − 4a2
= (3a2+2)2 − (2a)2
= (3a2+2a+2)(3a2−2a+2)
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