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D( x )
2*(4-x)^(1/2) = 0
4-x < 0
2*(4-x)^(1/2) = 0
2*(4-x)^(1/2) = 0
4-x = 0 // - 4
-x = -4 // * -1
x = 4
4-x < 0
4-x < 0
4-x < 0
-x < -4 // * -1
x > 4
x in (-oo:4)
(8-(3*x))/(2*(4-x)^(1/2)) = 0
(8-3*x)/(2*(4-x)^(1/2)) = 0
8-3*x = 0 // - 8
-3*x = -8 // : -3
x = -8/(-3)
x = 8/3
x = 8/3
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