What does -3(2x+1)^2+x simplify to?

Answer 1

First, square the value in parenthesis, so your equation is
-3(4x^2 + 4x +1) +x
Then you distribute the -3
-12x^2-12x-3 +x
And combine like terms
-12x^2-11x-3

Answer 2

(-3) (4 x ² + 4 x + 1) + x
- 12 x ² - 12 x - 3 + x
- 12 x ² - 11 x - 3