11n^2-1=9n

Simple and best practice solution for 11n^2-1=9n 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 11n^2-1=9n equation:


Simplifying
11n2 + -1 = 9n

Reorder the terms:
-1 + 11n2 = 9n

Solving
-1 + 11n2 = 9n

Solving for variable 'n'.

Reorder the terms:
-1 + -9n + 11n2 = 9n + -9n

Combine like terms: 9n + -9n = 0
-1 + -9n + 11n2 = 0

Begin completing the square.  Divide all terms by
11 the coefficient of the squared term: 

Divide each side by '11'.
-0.09090909091 + -0.8181818182n + n2 = 0

Move the constant term to the right:

Add '0.09090909091' to each side of the equation.
-0.09090909091 + -0.8181818182n + 0.09090909091 + n2 = 0 + 0.09090909091

Reorder the terms:
-0.09090909091 + 0.09090909091 + -0.8181818182n + n2 = 0 + 0.09090909091

Combine like terms: -0.09090909091 + 0.09090909091 = 0.00000000000
0.00000000000 + -0.8181818182n + n2 = 0 + 0.09090909091
-0.8181818182n + n2 = 0 + 0.09090909091

Combine like terms: 0 + 0.09090909091 = 0.09090909091
-0.8181818182n + n2 = 0.09090909091

The n term is -0.8181818182n.  Take half its coefficient (-0.4090909091).
Square it (0.1673553719) and add it to both sides.

Add '0.1673553719' to each side of the equation.
-0.8181818182n + 0.1673553719 + n2 = 0.09090909091 + 0.1673553719

Reorder the terms:
0.1673553719 + -0.8181818182n + n2 = 0.09090909091 + 0.1673553719

Combine like terms: 0.09090909091 + 0.1673553719 = 0.25826446281
0.1673553719 + -0.8181818182n + n2 = 0.25826446281

Factor a perfect square on the left side:
(n + -0.4090909091)(n + -0.4090909091) = 0.25826446281

Calculate the square root of the right side: 0.508197268

Break this problem into two subproblems by setting 
(n + -0.4090909091) equal to 0.508197268 and -0.508197268.

Subproblem 1

n + -0.4090909091 = 0.508197268 Simplifying n + -0.4090909091 = 0.508197268 Reorder the terms: -0.4090909091 + n = 0.508197268 Solving -0.4090909091 + n = 0.508197268 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '0.4090909091' to each side of the equation. -0.4090909091 + 0.4090909091 + n = 0.508197268 + 0.4090909091 Combine like terms: -0.4090909091 + 0.4090909091 = 0.0000000000 0.0000000000 + n = 0.508197268 + 0.4090909091 n = 0.508197268 + 0.4090909091 Combine like terms: 0.508197268 + 0.4090909091 = 0.9172881771 n = 0.9172881771 Simplifying n = 0.9172881771

Subproblem 2

n + -0.4090909091 = -0.508197268 Simplifying n + -0.4090909091 = -0.508197268 Reorder the terms: -0.4090909091 + n = -0.508197268 Solving -0.4090909091 + n = -0.508197268 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '0.4090909091' to each side of the equation. -0.4090909091 + 0.4090909091 + n = -0.508197268 + 0.4090909091 Combine like terms: -0.4090909091 + 0.4090909091 = 0.0000000000 0.0000000000 + n = -0.508197268 + 0.4090909091 n = -0.508197268 + 0.4090909091 Combine like terms: -0.508197268 + 0.4090909091 = -0.0991063589 n = -0.0991063589 Simplifying n = -0.0991063589

Solution

The solution to the problem is based on the solutions from the subproblems. n = {0.9172881771, -0.0991063589}

See similar equations:

| 5x-34=2x-14 | | 3y-1=12-4y | | X^3-3c^2-10x=0 | | (3x+9)+(2x-4)=180 | | C=r(a*2) | | 2x^2=12x+54 | | 3(12)+B(5)+4=0 | | C=r(a/2) | | x/2-610 | | Ax+2y-5=0 | | 8.28-2r=4r | | x+y+z=177 | | 3x-1=1000 | | 3x^2-40x-75=0 | | 2*sinx*cosx=1 | | h=.5*b*a | | H=.5*b/a | | 3x+6-5=5x+4 | | log(4)(5-2x)-log(4)(1-x)=log(4)(3-2x) | | 3x^2y-15x= | | 4(-4p-3)-3=-79 | | x(-8)=2 | | a^2+12742*a=1225 | | 5x-7=-60 | | (5x+2y)(5x-2y)=0 | | 12=5(log^3x)+2 | | x^2+6x-720= | | F(t)=-16t^2+80t+3 | | Y=0.9X+4.4 | | 8(3-2)-7m=0 | | -6-2m=12 | | 2(x+5)-8=0 |

Equations solver categories