(7x^2-15x+2)/(1-7x)

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Solution for (7x^2-15x+2)/(1-7x) equation: 


D( x )

1-(7*x) = 0

1-(7*x) = 0

1-(7*x) = 0

1-7*x = 0

1-7*x = 0 // - 1

-7*x = -1 // : -7

x = -1/(-7)

x = 1/7

x in (-oo:1/7) U (1/7:+oo)

(7*x^2-(15*x)+2)/(1-(7*x)) = 0

(7*x^2-15*x+2)/(1-7*x) = 0

7*x^2-15*x+2 = 0

7*x^2-15*x+2 = 0

DELTA = (-15)^2-(2*4*7)

DELTA = 169

DELTA > 0

x = (169^(1/2)+15)/(2*7) or x = (15-169^(1/2))/(2*7)

x = 2 or x = 1/7

(x-1/7)*(x-2) = 0

((x-1/7)*(x-2))/(1-7*x) = 0

( x-1/7 )

x-1/7 = 0 // + 1/7

x = 1/7

( x-2 )

x-2 = 0 // + 2

x = 2

x in { 1/7} 

x = 2

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