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D( y )
4*y^2-(4*y)-120 = 0
4*y^2-(4*y)-120 = 0
4*y^2-(4*y)-120 = 0
4*y^2-4*y-120 = 0
4*y^2-4*y-120 = 0
DELTA = (-4)^2-(-120*4*4)
DELTA = 1936
DELTA > 0
y = (1936^(1/2)+4)/(2*4) or y = (4-1936^(1/2))/(2*4)
y = 6 or y = -5
y in (-oo:-5) U (-5:6) U (6:+oo)
(y^3+5*y^2-(36*y)-180)/(4*y^2-(4*y)-120) = 0
(y^3+5*y^2-36*y-180)/(4*y^2-4*y-120) = 0
y^3+5*y^2-36*y-180 = 0
y^3+5*y^2-36*y-180
y^2*(y+5)-36*y-180
y^2*(y+5)-36*(y+5)
(y^2-36)*(y+5)
4*y^2-4*y-120 = 0
4*(y^2-y-30) = 0
y^2-y-30 = 0
DELTA = (-1)^2-(-30*1*4)
DELTA = 121
DELTA > 0
y = (121^(1/2)+1)/(1*2) or y = (1-121^(1/2))/(1*2)
y = 6 or y = -5
4*(y+5)*(y-6) = 0
((y^2-36)*(y+5))/(4*(y+5)*(y-6)) = 0
( y+5 )
y+5 = 0 // - 5
y = -5
( y^2-36 )
1*y^2 = 36 // : 1
y^2 = 36
y^2 = 36 // ^ 1/2
abs(y) = 6
y = 6 or y = -6
y in { -5}
y in { 6}
y = -6
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