Evaluate the expression a² + 6ab for a = - 2 and b = 4.

The given expression is:
[tex]a^2+6ab[/tex]Substitute the values a=-2 and b=4 into the expression:
[tex]\begin{gathered} (-2)^2+6\times(-2)\times(4) \\ =4+(-48)=4-48=-44 \end{gathered}[/tex]The value of the expression at the given values is -44.