factorize 4a^2+9b^2+16c^2+12ab-24bc-16ca
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= 4a²+9b²+16c²+12ab-24bc-16ca
= (2a)14+(3b)14+(-4c)²+2(2a)(3b)+2(3b)(-4c)+2(-4c)(2a)
= (2a+3b-4c)²
= (2a+3b-4c)(2a+3b-4c)
= (2a)14+(3b)14+(-4c)²+2(2a)(3b)+2(3b)(-4c)+2(-4c)(2a)
= (2a+3b-4c)²
= (2a+3b-4c)(2a+3b-4c)
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