Factor completely (3x^2-12x)(x^2-2x+1)

Answer question above and explain each step : )

Which elements in the set below are integers? 12, –3⁄4,√ 25 , –7, √ 5 , 14⁄7, 9 a. 12, √ 25 , –7, 9 b. 12, √ 25 , –7, 14⁄7, 9 c. –3⁄4, 25 , √ 5 ,14⁄7 d. 12, –7, 9

Cos^2x+cos^2(120°+x)+cos^2(120°-x)i need this asap. pls me