x*x+6*x=12

Simple and best practice solution for x*x+6*x=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*x+6*x=12 equation:


Simplifying
x * x + 6x = 12

Multiply x * x
x2 + 6x = 12

Reorder the terms:
6x + x2 = 12

Solving
6x + x2 = 12

Solving for variable 'x'.

Reorder the terms:
-12 + 6x + x2 = 12 + -12

Combine like terms: 12 + -12 = 0
-12 + 6x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + 6x + 12 + x2 = 0 + 12

Reorder the terms:
-12 + 12 + 6x + x2 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + 6x + x2 = 0 + 12
6x + x2 = 0 + 12

Combine like terms: 0 + 12 = 12
6x + x2 = 12

The x term is 6x.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6x + 9 + x2 = 12 + 9

Reorder the terms:
9 + 6x + x2 = 12 + 9

Combine like terms: 12 + 9 = 21
9 + 6x + x2 = 21

Factor a perfect square on the left side:
(x + 3)(x + 3) = 21

Calculate the square root of the right side: 4.582575695

Break this problem into two subproblems by setting 
(x + 3) equal to 4.582575695 and -4.582575695.

Subproblem 1

x + 3 = 4.582575695 Simplifying x + 3 = 4.582575695 Reorder the terms: 3 + x = 4.582575695 Solving 3 + x = 4.582575695 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = 4.582575695 + -3 Combine like terms: 3 + -3 = 0 0 + x = 4.582575695 + -3 x = 4.582575695 + -3 Combine like terms: 4.582575695 + -3 = 1.582575695 x = 1.582575695 Simplifying x = 1.582575695

Subproblem 2

x + 3 = -4.582575695 Simplifying x + 3 = -4.582575695 Reorder the terms: 3 + x = -4.582575695 Solving 3 + x = -4.582575695 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = -4.582575695 + -3 Combine like terms: 3 + -3 = 0 0 + x = -4.582575695 + -3 x = -4.582575695 + -3 Combine like terms: -4.582575695 + -3 = -7.582575695 x = -7.582575695 Simplifying x = -7.582575695

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.582575695, -7.582575695}

See similar equations:

| c*2+a*2+m*2=481 | | 5y-8=15-7Y | | 2/4-7 | | p^2x+3=2px+5 | | 1+y=(y+10)/3+1 | | 15p+14q+p-5q-7p= | | 3p^2x-3y+9=0 | | (x+4)3/4 | | 4px-2y+10=0 | | (1/4)*y+2/4-7=0 | | 17a+11b+3c+6c-2b-4a= | | 7m+6n-2m+10n= | | 14X+2Y+11Z=28.4 | | 36/b-3=0 | | y=(y+0.4)/3 | | y=(y+10)/3 | | 6(X+3)=3(X+11) | | 1/4(x+2)=5/6 | | 5+2,5= | | y=3y+10 | | 3y=-5x+9 | | -3x(1-4x)=0 | | c+a*2+m=154 | | 5x+3y-9=0 | | 2/4+1/4y=7 | | 4x+4+18x-6=6x+3-36 | | (3x-1)2=0 | | 6x-7w+3x+7y+4y+4w= | | (-2-x)(-2+x)-(4-4x+x^2)=2 | | t+1=6 | | (-2-x)(-2+a)-(4-4x+x^2)=2 | | -3x(5x-10)=0 |

Equations solver categories