(-40/(x^2-7x-18))=(2x/(x+2))

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Solution for (-40/(x^2-7x-18))=(2x/(x+2)) equation:


D( x )

x+2 = 0

x^2-(7*x)-18 = 0

x+2 = 0

x+2 = 0

x+2 = 0 // - 2

x = -2

x^2-(7*x)-18 = 0

x^2-(7*x)-18 = 0

x^2-7*x-18 = 0

x^2-7*x-18 = 0

DELTA = (-7)^2-(-18*1*4)

DELTA = 121

DELTA > 0

x = (121^(1/2)+7)/(1*2) or x = (7-121^(1/2))/(1*2)

x = 9 or x = -2

x in (-oo:-2) U (-2:9) U (9:+oo)

-40/(x^2-(7*x)-18) = (2*x)/(x+2) // - (2*x)/(x+2)

-40/(x^2-(7*x)-18)-((2*x)/(x+2)) = 0

-40/(x^2-7*x-18)-2*x*(x+2)^-1 = 0

(-2*x)/(x+2)-40/(x^2-7*x-18) = 0

x^2-7*x-18 = 0

x^2-7*x-18 = 0

x^2-7*x-18 = 0

DELTA = (-7)^2-(-18*1*4)

DELTA = 121

DELTA > 0

x = (121^(1/2)+7)/(1*2) or x = (7-121^(1/2))/(1*2)

x = 9 or x = -2

(x+2)*(x-9) = 0

(-2*x)/(x+2)-40/((x+2)*(x-9)) = 0

(-2*x*(x-9))/((x+2)*(x-9))-40/((x+2)*(x-9)) = 0

-2*x*(x-9)-40 = 0

18*x-2*x^2-40 = 0

18*x-2*x^2-40 = 0

2*(9*x-x^2-20) = 0

9*x-x^2-20 = 0

DELTA = 9^2-(-20*(-1)*4)

DELTA = 1

DELTA > 0

x = (1^(1/2)-9)/(-1*2) or x = (-1^(1/2)-9)/(-1*2)

x = 4 or x = 5

2*(x-4)*(x-5) = 0

(2*(x-4)*(x-5))/((x+2)*(x-9)) = 0

(2*(x-4)*(x-5))/((x+2)*(x-9)) = 0 // * (x+2)*(x-9)

2*(x-4)*(x-5) = 0

( x-4 )

x-4 = 0 // + 4

x = 4

( x-5 )

x-5 = 0 // + 5

x = 5

x in { 4, 5 }

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