To simplify the expression \( x^2 + 5x + 6x + 2 \), we combine like terms.
The \( x \) terms are \( 5x + 6x \), which adds up to \( 11x \).
So, the expression becomes:
\[ x^2 + 11x + 2 \]
Now, it is already in standard form \( ax^2 + bx + c \), where \( a = 1 \), \( b = 11 \), and \( c = 2 \).
Thus, the simplified expression in standard form is:
\[ \boxed{x^2 + 11x + 2} \]