Find the constant p such that x^2 - 5x - 12x + p is the square of a binomial.
If a number is a square of a binomial, it's discriminant is zero.
\(\Delta = {17}^2-4p=0\).
\(4p = {17}^2\)\(p=\frac{{17}^{2}}{4}=\frac{289}{4}\).
+1911 
+399 
