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D( x )
16*x-(x*x)-15 = 0
16*x-(x*x)-15 = 0
16*x-(x*x)-15 = 0
16*x-x^2-15 = 0
16*x-x^2-15 = 0
DELTA = 16^2-(-15*(-1)*4)
DELTA = 196
DELTA > 0
x = (196^(1/2)-16)/(-1*2) or x = (-196^(1/2)-16)/(-1*2)
x = 1 or x = 15
x in (-oo:1) U (1:15) U (15:+oo)
x/(16*x-(x*x)-15) = 0
x/(16*x-x^2-15) = 0
16*x-x^2-15 = 0
16*x-x^2-15 = 0
DELTA = 16^2-(-15*(-1)*4)
DELTA = 196
DELTA > 0
x = (196^(1/2)-16)/(-1*2) or x = (-196^(1/2)-16)/(-1*2)
x = 1 or x = 15
(x-1)*(x-15) = 0
x/((x-1)*(x-15)) = 0
x = 0
x = 0
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