if n= -2 then what is the answer to the sum 2n2 + 3n
\(\begin{array}{lcl} 2n^2 + 3n \qquad &| &\qquad n=-2 \\ 2\cdot (-2)^2 + 3\cdot (-2) \qquad &|& \qquad (-2)^2=(-2)\cdot(-2)=+4\\ &=& 2\cdot 4 -6 \\ &=& 8-6 \\ &=& 2 \end{array}\)
2n2 + 3n=(2(-2)2) + (3(-2))
-8 + (-6)=-14
