(a^2-2a-35)/(a+3)

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Solution for (a^2-2a-35)/(a+3) equation: 


D( a )

a+3 = 0

a+3 = 0

a+3 = 0

a+3 = 0 // - 3

a = -3

a in (-oo:-3) U (-3:+oo)

(a^2-(2*a)-35)/(a+3) = 0

(a^2-2*a-35)/(a+3) = 0

a^2-2*a-35 = 0

a^2-2*a-35 = 0

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

DELTA = 144

DELTA > 0

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

a = 7 or a = -5

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

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

( a+5 )

a+5 = 0 // - 5

a = -5

( a-7 )

a-7 = 0 // + 7

a = 7

a in { -5, 7 }

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