1. If one root of the quadratic equation \((k^2 + 9)x^2 + 7x - 6k\) is reciprocal of the other, then \(k\) is:
 
 
2. If \(x = 4\) is one root of the quadratic equation \(x^2 - kx + 28 = 0\), then find the value of \(k\).