(6a + 5b + 4c)2 - (60 - 56 - 4c)2
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Answer:
6a+5b-c
Step-by-step explanation:
=(6a+5b+4c)2-(4-4c)2
=6a+5b+4c+2-4-4c+2
=6a+5b+4c-4c+2-4+2
=6a+5b-c-2+2
=6a+5b-c
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