12x^3 - 3(2x^3 + 4x -1) - 5x + 7
I have changed your expession!. What do you want done with it? I will simplify it:
Simplify the following:
12 x^3-3 (2 x^3+4 x-1)-5 x+7
-3 (2 x^3+4 x-1) = -6 x^3-12 x+3:
-6 x^3-12 x+3+12 x^3-5 x+7
Grouping like terms, 12 x^3-6 x^3-5 x-12 x+3+7 = (12 x^3-6 x^3)+(-12 x-5 x)+(3+7):
(12 x^3-6 x^3)+(-12 x-5 x)+(3+7)
12 x^3-6 x^3 = 6 x^3:
6 x^3+(-12 x-5 x)+(3+7)
-12 x-5 x = -17 x:
6 x^3+-17 x+(3+7)
3+7 = 10:
Answer: | 6 x^3-17 x+10
