9a square + 16b square +25c square -24ab-40bc+30ac
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9a²+16b²+25c²-24ab-40bc-30ac
= (3a)²+(4b)²+(5c)²-(2*3a*4b) - (2*4b*5c) + (2*3a*5c)
= (3a-4b+5c)²
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