 wrote the correct values for \(
  c \) obtained from the formula \( c = 4x - 1 \) in the examples, the
  formula itself was written incorrectly as \( c = 4x - 3 \).  I have
  corrected this to \( c = 4x - 1 \) now.  Also, thank you both for
  your kind words about this post!
</p>
