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D( x )
(9-x)^0.5 = 0
9-x < 0
(9-x)^0.5 = 0
(9-x)^0.5 = 0
9-x = 0 // - 9
-x = -9 // * -1
x = 9
9-x < 0
9-x < 0
9-x < 0
-x < -9 // * -1
x > 9
x in (-oo:9)
(4*x)/((9-x)^0.5) = 0
4*x = 0 // : 4
x = 0
x = 0
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