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D( k )
k-8 = 0
k-8 = 0
k-8 = 0
k-8 = 0 // + 8
k = 8
k in (-oo:8) U (8:+oo)
(8*k^2+55*k-75)/(k-8) = 0
8*k^2+55*k-75 = 0
8*k^2+55*k-75 = 0
DELTA = 55^2-(-75*4*8)
DELTA = 5425
DELTA > 0
k = (5425^(1/2)-55)/(2*8) or k = (-5425^(1/2)-55)/(2*8)
k = (5*217^(1/2)-55)/16 or k = (-5*217^(1/2)-55)/16
(k-((-5*217^(1/2)-55)/16))*(k-((5*217^(1/2)-55)/16)) = 0
((k-((-5*217^(1/2)-55)/16))*(k-((5*217^(1/2)-55)/16)))/(k-8) = 0
( k-((-5*217^(1/2)-55)/16) )
k-((-5*217^(1/2)-55)/16) = 0 // + (-5*217^(1/2)-55)/16
k = (-5*217^(1/2)-55)/16
( k-((5*217^(1/2)-55)/16) )
k-((5*217^(1/2)-55)/16) = 0 // + (5*217^(1/2)-55)/16
k = (5*217^(1/2)-55)/16
k in { (-5*217^(1/2)-55)/16, (5*217^(1/2)-55)/16 }
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