Find a so that ax^2 + 15x + 4 + 3x + 5 is the square of a binomial.
a x^2 + 18x + 9 divide by 9
a/9 x^2 + 2x + 1 a/9 = 1 so a = 9
9* (x+1)^2 =
(3x+3)2
+36916 
