(x^2-9)/(7x^2-21x)

Simple and best practice solution for (x^2-9)/(7x^2-21x) equation. Check how easy it is, and learn it for the future. Our solution is simple, and easy to understand, so don`t hesitate to use it as a solution of your homework.

If it's not what You are looking for type in the equation solver your own equation and let us solve it.

Solution for (x^2-9)/(7x^2-21x) equation: 


D( x )

7*x^2-(21*x) = 0

7*x^2-(21*x) = 0

7*x^2-(21*x) = 0

7*x^2-21*x = 0

7*x^2-21*x = 0

DELTA = (-21)^2-(0*4*7)

DELTA = 441

DELTA > 0

x = (441^(1/2)+21)/(2*7) or x = (21-441^(1/2))/(2*7)

x = 3 or x = 0

x in (-oo:0) U (0:3) U (3:+oo)

(x^2-9)/(7*x^2-(21*x)) = 0

(x^2-9)/(7*x^2-21*x) = 0

7*x^2-21*x = 0

7*x*(x-3) = 0

x-3 = 0 // + 3

x = 3

7*x*(x-3) = 0

(x^2-9)/(7*x*(x-3)) = 0

1*x^2 = 9 // : 1

x^2 = 9

x^2 = 9 // ^ 1/2

abs(x) = 3

x = 3 or x = -3

x in { 3} 

x = -3

See similar equations:

| 11-x=12 | | 30-x/x=8/7 | | 2m-3=6m+25 | | 140/x=4 | | 3/5×3-7/2×4 | | 15x-9=3(3x-1)+6x-6 | | 3=27-4x | | 3/4y-6=4 | | (16/15)*5 | | -3x+7y=-29 | | 3n+2.8=4.9 | | ex=70 | | -x^2+3x^2=98 | | 8s/8=1/2/8 | | 2y+22x=-8 | | 7x=8(30-x) | | 94=4x+62 | | 8d+5d= | | 22x+2y=-8 | | 9.3-3.9(6y+7)+1.2+2.6y= | | 2x+1081=213483 | | 8s/8=1/2 | | =3a-54a | | -6.5p=-58.5 | | 5+4n-0n=5 | | 11x+22=5x+172 | | 280=.25x+80 | | 4n+6=74 | | 1/3=r-3/4 | | 117=65+b | | -5x-103=79+12x | | 4(-2+8x-3y)= |

Equations solver categories