(x+7)/(2x+6)=x/(9-x^2)

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Solution for (x+7)/(2x+6)=x/(9-x^2) equation:


D( x )

9-x^2 = 0

2*x+6 = 0

9-x^2 = 0

9-x^2 = 0

-1*x^2 = -9 // : -1

x^2 = 9

x^2 = 9 // ^ 1/2

abs(x) = 3

x = 3 or x = -3

2*x+6 = 0

2*x+6 = 0

2*x+6 = 0 // - 6

2*x = -6 // : 2

x = -6/2

x = -3

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

(x+7)/(2*x+6) = x/(9-x^2) // - x/(9-x^2)

(x+7)/(2*x+6)-(x/(9-x^2)) = 0

(x+7)/(2*x+6)+(-1*x)/(9-x^2) = 0

((x+7)*(9-x^2))/((2*x+6)*(9-x^2))+(-1*x*(2*x+6))/((2*x+6)*(9-x^2)) = 0

(x+7)*(9-x^2)-1*x*(2*x+6) = 0

3*x-x^3-9*x^2+63 = 0

3*x-x^3-9*x^2+63 = 0

3*x-x^3-9*x^2+63 = 0

{ 1, -1, 3, -3, 7, -7, 9, -9, 21, -21, 63, -63 }

1

x = 1

3*x-x^3-9*x^2+63 = 56

1

-1

x = -1

3*x-x^3-9*x^2+63 = 52

-1

3

x = 3

3*x-x^3-9*x^2+63 = -36

3

-3

x = -3

3*x-x^3-9*x^2+63 = 0

-3

x+3

21-x^2-6*x

3*x-x^3-9*x^2+63

x+3

x^3+3*x^2

3*x-6*x^2+63

6*x^2+18*x

21*x+63

-21*x-63

0

21-x^2-6*x = 0

DELTA = (-6)^2-(-1*4*21)

DELTA = 120

DELTA > 0

x = (120^(1/2)+6)/(-1*2) or x = (6-120^(1/2))/(-1*2)

x = (2*30^(1/2)+6)/(-2) or x = (6-2*30^(1/2))/(-2)

x in { (2*30^(1/2)+6)/(-2), (6-2*30^(1/2))/(-2), -3}

(x-((2*30^(1/2)+6)/(-2)))*(x-((6-2*30^(1/2))/(-2)))*(x+3) = 0

((x-((2*30^(1/2)+6)/(-2)))*(x-((6-2*30^(1/2))/(-2)))*(x+3))/((2*x+6)*(9-x^2)) = 0

((x-((2*30^(1/2)+6)/(-2)))*(x-((6-2*30^(1/2))/(-2)))*(x+3))/((2*x+6)*(9-x^2)) = 0 // * (2*x+6)*(9-x^2)

(x-((2*30^(1/2)+6)/(-2)))*(x-((6-2*30^(1/2))/(-2)))*(x+3) = 0

( x+3 )

x+3 = 0 // - 3

x = -3

( x-((2*30^(1/2)+6)/(-2)) )

x-((2*30^(1/2)+6)/(-2)) = 0 // + (2*30^(1/2)+6)/(-2)

x = (2*30^(1/2)+6)/(-2)

( x-((6-2*30^(1/2))/(-2)) )

x-((6-2*30^(1/2))/(-2)) = 0 // + (6-2*30^(1/2))/(-2)

x = (6-2*30^(1/2))/(-2)

x in { -3}

x in { (2*30^(1/2)+6)/(-2), (6-2*30^(1/2))/(-2) }

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