You can put this solution on YOUR website!
To do this problem, think about the quadratic
. Where is this quadratic zero? Note that the quadratic factors to (a-3)(a+5), so it is zero when a = 3 and when a = -5.
Now when is the quadratic bigger than zero? To solve this, think about graphing the quadratic.
The graph tells us that it is bigger than zero when x [or in our case, a] is less than -5 or greater than 3.
So the solution to this is