64 square – 9b square + 42 B C - 49 c square
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64a²-(9b²-42bc+49c²)
now solve it
with a²-2ab+b²=(a+b)²
we get the answer
64a²-(3b-7c)²
now solve it
with a²-2ab+b²=(a+b)²
we get the answer
64a²-(3b-7c)²
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