I am asked to graph this equation by plotting points;

$\displaystyle y=-x^2+4$

So far I have used these numbers to get the value of $\displaystyle y$

x=0 y=4

x=1 y=5

x=2 y=8

But the problem I am having is that if I keep on, the value for $\displaystyle y$ gets further away from the first two points.

If I use a negative number it obviously becomes a positive number....

Could I multiply the entire equation by $\displaystyle -1$ so that the $\displaystyle 4$ becomes a negative?

Many thanks in advance

BTW, how do I create a space between the numbers so that when I post it doesn't look too awkward, or confusing??!??