http://prntscr.com/n5h7l7
So 5.b) how do I make the 16a2 positive?
The denominator cannot = 0 This would be 'non-permissable'
16-16a^2 cannot = 0
Let's find where that is:
16-16a^2 = 0
16 = 16a^2
1= a^2
a = 1 or -1 <-------Non-permissable points
+36916 
