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D( y )
y^2 = 0
y^2 = 0
y^2 = 0
1*y^2 = 0 // : 1
y^2 = 0
y = 0
y in (-oo:0) U (0:+oo)
(3*y)/(y^2)-(7*y)+10 = 0
(3*y)/(y^2)-7*y+10 = 0
3*y^-1-7*y^1+10*y^0 = 0
(10*y^1-7*y^2+3*y^0)/(y^1) = 0 // * y^2
y^1*(10*y^1-7*y^2+3*y^0) = 0
y^1
10*y-7*y^2+3 = 0
10*y-7*y^2+3 = 0
DELTA = 10^2-(-7*3*4)
DELTA = 84+100
DELTA = 184
DELTA > 0
y = ((84+100)^(1/2)-10)/(-7*2) or y = (-(84+100)^(1/2)-10)/(-7*2)
y = ((84+100)^(1/2)-10)/(-14) or y = ((84+100)^(1/2)+10)/14
y in { ((84+100)^(1/2)-10)/(-14), ((84+100)^(1/2)+10)/14}
y in { ((84+100)^(1/2)-10)/(-14), ((84+100)^(1/2)+10)/14 }
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