Factors of 9a²+49b²+c²-42ab+14bc-6ac
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(-a+b+c)²
Step-by-step explanation:
9a²+49b²+c²-42ab+14bc-6ac
= (3a)²+(7b)²+c²-42ab+14bc-6ac
= (3a)²+(7b)²+c²-2*(3a)*(7b)+2*(7b)*c-2*(3a)*c
= (-a+b+c)²
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