17.78 Use Problems
Condition: Find the area of definition \ (d (f) function \ (y = f (x) \) \ [f (x) = \ sqrt {\ frac {x-4} {(x+1) (x-2)} \]
Problems of the Use (Unified state Exam) - Equations and Inequalites in Terms of A Parameter, Solved Both by Algebraic Methods and Geometric One.