(2a^2-8)/(a-4)

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Solution for (2a^2-8)/(a-4) equation: 


D( a )

a-4 = 0

a-4 = 0

a-4 = 0

a-4 = 0 // + 4

a = 4

a in (-oo:4) U (4:+oo)

(2*a^2-8)/(a-4) = 0

2*a^2 = 8 // : 2

a^2 = 4

a^2 = 4 // ^ 1/2

abs(a) = 2

a = 2 or a = -2

a in { 2, -2 }

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