Find the values of the variable that must be excluded for the rational expression. 
Definitions:
Q9: Add or subtract the rational expressions. Reduce
Q26: Divide rationalize the denominator and simplify. <img
Q37: Factor the polynomial expression. If the polynomial
Q40: Simplify the rational expression. <img src="https://d2lvgg3v3hfg70.cloudfront.net/TBX8673/.jpg" alt="Simplify
Q64: Solve the radical equation. <img src="https://d2lvgg3v3hfg70.cloudfront.net/TBX8673/.jpg" alt="Solve
Q72: Suppose that <img src="https://d2lvgg3v3hfg70.cloudfront.net/TBX8673/.jpg" alt="Suppose that
Q113: Add or subtract the rational expressions. Reduce
Q127: Solve the equation. <img src="https://d2lvgg3v3hfg70.cloudfront.net/TBX8673/.jpg" alt="Solve the
Q132: Evaluate the radical expression for the given
Q279: For the polynomial expression factor out the