(8x-40)/(x^2-81)

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Solution for (8x-40)/(x^2-81) equation: 


D( x )

x^2-81 = 0

x^2-81 = 0

x^2-81 = 0

1*x^2 = 81 // : 1

x^2 = 81

x^2 = 81 // ^ 1/2

abs(x) = 9

x = 9 or x = -9

x in (-oo:-9) U (-9:9) U (9:+oo)

(8*x-40)/(x^2-81) = 0

8*x-40 = 0 // + 40

8*x = 40 // : 8

x = 40/8

x = 5

x = 5

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