(3) (7a - 6b + 5c)2 + (7a + 6b - 5c)2
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Answer:28a
Step-by-step explanation:2*7a*-6b*5c=14a-12b+10c+2*7a*6b*-5c=14a+12b-10c
=14a+14a=
28a
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