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D( x )
x^2+3*x-10 = 0
x^2+3*x-10 = 0
x^2+3*x-10 = 0
x^2+3*x-10 = 0
DELTA = 3^2-(-10*1*4)
DELTA = 49
DELTA > 0
x = (49^(1/2)-3)/(1*2) or x = (-49^(1/2)-3)/(1*2)
x = 2 or x = -5
x in (-oo:-5) U (-5:2) U (2:+oo)
(5*x^2+40*x+75)/(x^2+3*x-10) = 0
5*x^2+40*x+75 = 0
5*(x^2+8*x+15) = 0
x^2+8*x+15 = 0
DELTA = 8^2-(1*4*15)
DELTA = 4
DELTA > 0
x = (4^(1/2)-8)/(1*2) or x = (-4^(1/2)-8)/(1*2)
x = -3 or x = -5
5*(x+5)*(x+3) = 0
x^2+3*x-10 = 0
x^2+3*x-10 = 0
DELTA = 3^2-(-10*1*4)
DELTA = 49
DELTA > 0
x = (49^(1/2)-3)/(1*2) or x = (-49^(1/2)-3)/(1*2)
x = 2 or x = -5
(x+5)*(x-2) = 0
(5*(x+5)*(x+3))/((x+5)*(x-2)) = 0
( x+3 )
x+3 = 0 // - 3
x = -3
( x+5 )
x+5 = 0 // - 5
x = -5
x in { -5}
x = -3
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