x^2=-8x-1

Simple and best practice solution for x^2=-8x-1 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=-8x-1 equation:


Simplifying
x2 = -8x + -1

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

Solving
x2 = -1 + -8x

Solving for variable 'x'.

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

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

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

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

Begin completing the square.

Move the constant term to the right:

Add '-1' to each side of the equation.
1 + 8x + -1 + x2 = 0 + -1

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

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

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

The x term is 8x.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8x + 16 + x2 = -1 + 16

Reorder the terms:
16 + 8x + x2 = -1 + 16

Combine like terms: -1 + 16 = 15
16 + 8x + x2 = 15

Factor a perfect square on the left side:
(x + 4)(x + 4) = 15

Calculate the square root of the right side: 3.872983346

Break this problem into two subproblems by setting 
(x + 4) equal to 3.872983346 and -3.872983346.

Subproblem 1

x + 4 = 3.872983346 Simplifying x + 4 = 3.872983346 Reorder the terms: 4 + x = 3.872983346 Solving 4 + x = 3.872983346 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = 3.872983346 + -4 Combine like terms: 4 + -4 = 0 0 + x = 3.872983346 + -4 x = 3.872983346 + -4 Combine like terms: 3.872983346 + -4 = -0.127016654 x = -0.127016654 Simplifying x = -0.127016654

Subproblem 2

x + 4 = -3.872983346 Simplifying x + 4 = -3.872983346 Reorder the terms: 4 + x = -3.872983346 Solving 4 + x = -3.872983346 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = -3.872983346 + -4 Combine like terms: 4 + -4 = 0 0 + x = -3.872983346 + -4 x = -3.872983346 + -4 Combine like terms: -3.872983346 + -4 = -7.872983346 x = -7.872983346 Simplifying x = -7.872983346

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.127016654, -7.872983346}

See similar equations:

| y+(y+3)(-3)=y-3 | | 115-10d=55 | | y^2+27y-324=0 | | 5t^2+9t-15=0 | | Y=8x+4x-5x | | Y^4+27y^2-342=0 | | 7r+4s-(2r-6s)= | | 18y/60 | | -1/6t=6 | | 6x-5+2x=31 | | 12x-14+20x+34=12x-14 | | 15f=24-u | | 2.6x=9.88 | | x-5+35=90 | | -x-102=98+9x | | 6x+9=-6x+141 | | 2(v-8)-6=-2(-8v+5)-5v | | x+2y+x-2y=150 | | 12x+5=47+5x | | 20/25=7/x | | .4(x-1)-.6(2x-3)=-4.2 | | 2x^2-2=x | | x-2(-1+-2X)=12 | | 3v+4+3=14+4v | | 2x+3(-4x-16)=-98 | | 21+6g=57 | | x+2y=c | | 2/3b=24 | | 95=5(b+11) | | -(4a+1)-(3a-5)=14-(4a+4) | | 17+9c=44 | | -6x-50=34-3x |

Equations solver categories