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D( x )
x^2-(8*x) <= 0
x^2-(8*x) <= 0
x^2-(8*x) <= 0
x^2-8*x <= 0
x^2-8*x <= 0
DELTA = (-8)^2-(0*1*4)
DELTA = 64
DELTA > 0
x = (64^(1/2)+8)/(1*2) or x = (8-64^(1/2))/(1*2)
x = 8 or x = 0
a = 1
a > 0
x in <0:8>
x in (-oo:0) U (8:+oo)
log(27)(x^2-(8*x)) = 2/3 // - 2/3
log(27)(x^2-(8*x))-(2/3) = 0
log(27)(x^2-8*x)-2/3 = 0
log(27)(x^2-8*x)-2/3 = 0 // + 2/3
log(27)(x^2-8*x) = 2/3
log(27)(x^2-8*x) = log(27)(27^(2/3))
x^2-8*x = 27^(2/3)
x^2-8*x-27^(2/3) = 0
x^2-8*x-9 = 0
DELTA = (-8)^2-(-9*1*4)
DELTA = 100
DELTA > 0
x = (100^(1/2)+8)/(1*2) or x = (8-100^(1/2))/(1*2)
x = 9 or x = -1
x in { -1, 9 }
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