Use Routh's criteria to find the range of Kₚ for which all roots of the following CE are in the LHP:
s⁴+4.s³+6.s²+4.s+Kₚ=0

First, use Routh's first criterion to symbolically specify any limitations on controller gain.
• Use ONLY the symbolic variable Kₚ and numerals.
o These symbolic variables and functions are case sensitive (e.g. A a, etc.).
o Use the "Relations" tab within the calcPad to enter appropriate operators(<, >, 3, 5, etc.) as needed.
o Notation can be interchanged (e.g. X510 is equivalent to 103x).