(3x+2)squared -3(3x+2)+1

i have the answer but i don't understand what is going on in  the part with the 12x...everything else makes sense. Why 12 x?

The answer is to the next step is : 9x squared +1 2x + 4 - 9x - 6 + 1
in order of operations by

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2 Answers

(3x -2)^2 - 3(3x + 2) +1 distribute first

(3x - 2)(3x - 2) -9x -6 +1  (-12x is -6x + -6x)

9x^2 -12x +4 -9x -5

9x^2 -21x -1

by Level 10 User (55.7k points)
1+2+3........+100=
by

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