Math factorization in grade one, to complete the process 6, please answer in detail, thank you! (10 15:55:3) a4b4-c4

a4b4-c4
=(ab)4-c4
=[(ab)²]²-(c²)²
=[(ab)²-c²][(ab)²+c²]
=(ab+c)(ab-c)[(ab)²+c²]

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