The Answers community requires more information for this question. Please edit your question to include more context. There is no standardisation in the use of r and s in factored equations.
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(r+5)(r-4) The idea is to get two numbers whose product in this case is -20, and whose sum in this case s +1.
If Q = R/S then R = QxS and S = R/Q You can easily replace the letters with numbers such as Q = 2, R = 6 and S = 3 and then write out all three equations and you'll see that they make sense.
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Numeral-initial equations refer to mathematical equations where the unknown quantity is represented by a numeral, typically a letter such as x or y. These equations are commonly used in algebra to represent relationships between variables and solve for unknown values. By assigning a numeral to the unknown quantity, we can manipulate the equation using mathematical operations to find the value of the variable.
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