x(2x+11)=12

Simple and best practice solution for x(2x+11)=12 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(2x+11)=12 equation:


Simplifying
x(2x + 11) = 12

Reorder the terms:
x(11 + 2x) = 12
(11 * x + 2x * x) = 12
(11x + 2x2) = 12

Solving
11x + 2x2 = 12

Solving for variable 'x'.

Reorder the terms:
-12 + 11x + 2x2 = 12 + -12

Combine like terms: 12 + -12 = 0
-12 + 11x + 2x2 = 0

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

Divide each side by '2'.
-6 + 5.5x + x2 = 0

Move the constant term to the right:

Add '6' to each side of the equation.
-6 + 5.5x + 6 + x2 = 0 + 6

Reorder the terms:
-6 + 6 + 5.5x + x2 = 0 + 6

Combine like terms: -6 + 6 = 0
0 + 5.5x + x2 = 0 + 6
5.5x + x2 = 0 + 6

Combine like terms: 0 + 6 = 6
5.5x + x2 = 6

The x term is 5.5x.  Take half its coefficient (2.75).
Square it (7.5625) and add it to both sides.

Add '7.5625' to each side of the equation.
5.5x + 7.5625 + x2 = 6 + 7.5625

Reorder the terms:
7.5625 + 5.5x + x2 = 6 + 7.5625

Combine like terms: 6 + 7.5625 = 13.5625
7.5625 + 5.5x + x2 = 13.5625

Factor a perfect square on the left side:
(x + 2.75)(x + 2.75) = 13.5625

Calculate the square root of the right side: 3.682729966

Break this problem into two subproblems by setting 
(x + 2.75) equal to 3.682729966 and -3.682729966.

Subproblem 1

x + 2.75 = 3.682729966 Simplifying x + 2.75 = 3.682729966 Reorder the terms: 2.75 + x = 3.682729966 Solving 2.75 + x = 3.682729966 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.75' to each side of the equation. 2.75 + -2.75 + x = 3.682729966 + -2.75 Combine like terms: 2.75 + -2.75 = 0.00 0.00 + x = 3.682729966 + -2.75 x = 3.682729966 + -2.75 Combine like terms: 3.682729966 + -2.75 = 0.932729966 x = 0.932729966 Simplifying x = 0.932729966

Subproblem 2

x + 2.75 = -3.682729966 Simplifying x + 2.75 = -3.682729966 Reorder the terms: 2.75 + x = -3.682729966 Solving 2.75 + x = -3.682729966 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.75' to each side of the equation. 2.75 + -2.75 + x = -3.682729966 + -2.75 Combine like terms: 2.75 + -2.75 = 0.00 0.00 + x = -3.682729966 + -2.75 x = -3.682729966 + -2.75 Combine like terms: -3.682729966 + -2.75 = -6.432729966 x = -6.432729966 Simplifying x = -6.432729966

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.932729966, -6.432729966}

See similar equations:

| (X+2)(x-2)=5(x+4) | | 2x-4(x-3)=15 | | 4x^2-52x+153=0 | | 9y-2y=5(y-4) | | 3x^2*(x^2-1)-x^3*2x=0 | | 2u^2-7u+3=2 | | 7x+5=3x+18 | | x=156+0.6x | | x(2x^2-32)=0 | | 100-8y=60 | | 3a-6=a-4 | | 6logx+2=0 | | z^6=27 | | 3=1+0.5v | | 2r+9=r+15 | | z^2+16+30i=0 | | 0.05(500)+40=0.07(500)+30 | | x^3=0.75 | | f(x)=x^3+13x^2+36x | | x^3+6x^2+11x-6=0 | | 0.05x+40=0.07x+30 | | 2u^2-7u-11=0 | | -80-12.2= | | 36=x-50 | | 7x=2x+-35 | | 10=a*1 | | 3(2m-1)+5=6(m+1) | | 3(2m-1)=6(m+1) | | 2y=8-2x | | y=-1E-05x+0.004 | | 3y-11=7 | | 2x+300=5x |

Equations solver categories