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D( x )
9-x < 0
9-x < 0
9-x < 0
9-x < 0
-x < -9 // * -1
x > 9
x in (-oo:9>
3-x = (9-x)^(1/2) // - (9-x)^(1/2)
3-(9-x)^(1/2)-x = 0
-(9-x)^(1/2) = 3-x // - 3-x
-(9-x)^(1/2) = -(3-x) // ^ 2
abs(9-x) = (-(3-x))^2 // - (-(3-x))^2
abs(9-x)-(-(3-x))^2 = 0
x in (-oo:+oo)
abs(9-x)
9-x >= 0
9-x >= 0
-x >= -9 // * -1
x <= 9
x in (-oo:9>
9-(-(3-x))^2-x = 0
x in (9:+oo)
x-(-(3-x))^2-9 = 0
abs(9-x)-(-(3-x))^2 = 0
/ | 9-(-(3-x))^2-x = 0 i x in (-oo:9> | x-(-(3-x))^2-9 = 0 i x in (9:+oo)
x in (-oo:9>
9-(-(3-x))^2-x = 0
9-1*(x-3)^2-x = 0
9-1*(x-3)^2-x = 0
5*x-x^2-9+9 = 0
5*x-x^2 = 0
5*x-x^2 = 0
x*(5-x) = 0
5-x = 0 // - 5
-x = -5 // * -1
x = 5
x*(x-5) = 0
x*(x-5) = 0
( x-5 )
x-5 = 0 // + 5
x = 5
( x )
x = 0
x in (9:+oo)
x-(-(3-x))^2-9 = 0
x-1*(x-3)^2-9 = 0
x-1*(x-3)^2-9 = 0
7*x-x^2-9-9 = 0
7*x-x^2-18 = 0
7*x-x^2-18 = 0
7*x-x^2-18 = 0
DELTA = 7^2-(-18*(-1)*4)
DELTA = -23
DELTA < 0
1 = 0
1 = 0
x in { 5, 0 }
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