(p^2-4p-21)/(p^2-2p-35)

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Solution for (p^2-4p-21)/(p^2-2p-35) equation: 


D( p )

p^2-(2*p)-35 = 0

p^2-(2*p)-35 = 0

p^2-(2*p)-35 = 0

p^2-2*p-35 = 0

p^2-2*p-35 = 0

DELTA = (-2)^2-(-35*1*4)

DELTA = 144

DELTA > 0

p = (144^(1/2)+2)/(1*2) or p = (2-144^(1/2))/(1*2)

p = 7 or p = -5

p in (-oo:-5) U (-5:7) U (7:+oo)

(p^2-(4*p)-21)/(p^2-(2*p)-35) = 0

(p^2-4*p-21)/(p^2-2*p-35) = 0

p^2-4*p-21 = 0

p^2-4*p-21 = 0

DELTA = (-4)^2-(-21*1*4)

DELTA = 100

DELTA > 0

p = (100^(1/2)+4)/(1*2) or p = (4-100^(1/2))/(1*2)

p = 7 or p = -3

(p+3)*(p-7) = 0

p^2-2*p-35 = 0

p^2-2*p-35 = 0

DELTA = (-2)^2-(-35*1*4)

DELTA = 144

DELTA > 0

p = (144^(1/2)+2)/(1*2) or p = (2-144^(1/2))/(1*2)

p = 7 or p = -5

(p+5)*(p-7) = 0

((p+3)*(p-7))/((p+5)*(p-7)) = 0

( p+3 )

p+3 = 0 // - 3

p = -3

( p-7 )

p-7 = 0 // + 7

p = 7

p in { 7} 

p = -3

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