0=-x^2-6x+8

Simple and best practice solution for 0=-x^2-6x+8 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 0=-x^2-6x+8 equation:


Simplifying
0 = -1x2 + -6x + 8

Reorder the terms:
0 = 8 + -6x + -1x2

Solving
0 = 8 + -6x + -1x2

Solving for variable 'x'.

Combine like terms: 0 + -8 = -8
-8 + 6x + x2 = 8 + -6x + -1x2 + -8 + 6x + x2

Reorder the terms:
-8 + 6x + x2 = 8 + -8 + -6x + 6x + -1x2 + x2

Combine like terms: 8 + -8 = 0
-8 + 6x + x2 = 0 + -6x + 6x + -1x2 + x2
-8 + 6x + x2 = -6x + 6x + -1x2 + x2

Combine like terms: -6x + 6x = 0
-8 + 6x + x2 = 0 + -1x2 + x2
-8 + 6x + x2 = -1x2 + x2

Combine like terms: -1x2 + x2 = 0
-8 + 6x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + 6x + 8 + x2 = 0 + 8

Reorder the terms:
-8 + 8 + 6x + x2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + 6x + x2 = 0 + 8
6x + x2 = 0 + 8

Combine like terms: 0 + 8 = 8
6x + x2 = 8

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 = 8 + 9

Reorder the terms:
9 + 6x + x2 = 8 + 9

Combine like terms: 8 + 9 = 17
9 + 6x + x2 = 17

Factor a perfect square on the left side:
(x + 3)(x + 3) = 17

Calculate the square root of the right side: 4.123105626

Break this problem into two subproblems by setting 
(x + 3) equal to 4.123105626 and -4.123105626.

Subproblem 1

x + 3 = 4.123105626 Simplifying x + 3 = 4.123105626 Reorder the terms: 3 + x = 4.123105626 Solving 3 + x = 4.123105626 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 = 4.123105626 + -3 Combine like terms: 3 + -3 = 0 0 + x = 4.123105626 + -3 x = 4.123105626 + -3 Combine like terms: 4.123105626 + -3 = 1.123105626 x = 1.123105626 Simplifying x = 1.123105626

Subproblem 2

x + 3 = -4.123105626 Simplifying x + 3 = -4.123105626 Reorder the terms: 3 + x = -4.123105626 Solving 3 + x = -4.123105626 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 = -4.123105626 + -3 Combine like terms: 3 + -3 = 0 0 + x = -4.123105626 + -3 x = -4.123105626 + -3 Combine like terms: -4.123105626 + -3 = -7.123105626 x = -7.123105626 Simplifying x = -7.123105626

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.123105626, -7.123105626}

See similar equations:

| n+6+2=-16+5n | | (1/3)3.14(60^2)20 | | 6x+1=-2x | | -0.01*x^2+0.8*x+5.5=0 | | 6x+11=39 | | y=-5+4x+x^2 | | ax^2-4x^2+ax+8=0 | | f(x)=x^3-125 | | 4(5h-2)=48 | | 13+2z=29+10z | | (3-4x)(3x+2)=0 | | 6+3z=-39+8z | | 6x+24y=42 | | 4b+5=-2b-19 | | 7b-5=4b+1 | | 16b^2-40b+9=0 | | 6y-1=5y+6 | | 3-10=x | | 6y-1+5y=6 | | -x+4x-3=5-2x | | 7z-17=4z+4 | | 4x+3x-2x=45 | | 6b-41=2b-9 | | 5+p=7 | | 9c+5=2c+19 | | N-1/11=21/11 | | x+4+x=18+3 | | A+c=280 | | x^2=25x-89 | | 3x-4(4+5x)=15 | | 4(x+7)-15=3x | | x^2+4xy+5y^2=5 |

Equations solver categories