Question 62389
18.  y=-x^2-2x


I have a table of values for x

-3
When x=-3 {{{y=-(-3)^2-2(-3)}}}
{{{y=-(9)+6}}}
{{{y=-3}}}
-2
When x=-2 {{{y=-(-2)^2-2(-2)}}}
{{{y=-(4)+4}}}
{{{y=0}}}
-1
When x=-1 {{{y=-(-1)^2-2(-1)}}}
{{{y=-(1)+2}}}
{{{y=1}}}
0
When x=0 {{{y=-(0)^2-2(0)}}}
{{{y=-0-0}}}
{{{y=0}}}
1
When x=1 {{{y=-(1)^2-2(1)}}}
{{{y=-(1)-2}}}
{{{y=-3}}}
:
I hope my demonastration answered your question.  When you substitute numbers in for x, it helps to put them in parentheses to know what exactly your squaring and how your signs are effected.
Happy Calculating!!!