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D( y )
5*y^2-(60*y)+160 = 0
5*y^2-(60*y)+160 = 0
5*y^2-(60*y)+160 = 0
5*y^2-60*y+160 = 0
5*y^2-60*y+160 = 0
DELTA = (-60)^2-(4*5*160)
DELTA = 400
DELTA > 0
y = (400^(1/2)+60)/(2*5) or y = (60-400^(1/2))/(2*5)
y = 8 or y = 4
y in (-oo:4) U (4:8) U (8:+oo)
(y^2-(11*y)+28)/(5*y^2-(60*y)+160) = 0
(y^2-11*y+28)/(5*y^2-60*y+160) = 0
y^2-11*y+28 = 0
y^2-11*y+28 = 0
DELTA = (-11)^2-(1*4*28)
DELTA = 9
DELTA > 0
y = (9^(1/2)+11)/(1*2) or y = (11-9^(1/2))/(1*2)
y = 7 or y = 4
(y-4)*(y-7) = 0
5*y^2-60*y+160 = 0
5*(y^2-12*y+32) = 0
y^2-12*y+32 = 0
DELTA = (-12)^2-(1*4*32)
DELTA = 16
DELTA > 0
y = (16^(1/2)+12)/(1*2) or y = (12-16^(1/2))/(1*2)
y = 8 or y = 4
5*(y-4)*(y-8) = 0
((y-4)*(y-7))/(5*(y-4)*(y-8)) = 0
( y-4 )
y-4 = 0 // + 4
y = 4
( y-7 )
y-7 = 0 // + 7
y = 7
y in { 4}
y = 7
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