x^2-8x-64=0

Simple and best practice solution for x^2-8x-64=0 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-64=0 equation:


Simplifying
x2 + -8x + -64 = 0

Reorder the terms:
-64 + -8x + x2 = 0

Solving
-64 + -8x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '64' to each side of the equation.
-64 + -8x + 64 + x2 = 0 + 64

Reorder the terms:
-64 + 64 + -8x + x2 = 0 + 64

Combine like terms: -64 + 64 = 0
0 + -8x + x2 = 0 + 64
-8x + x2 = 0 + 64

Combine like terms: 0 + 64 = 64
-8x + x2 = 64

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 = 64 + 16

Reorder the terms:
16 + -8x + x2 = 64 + 16

Combine like terms: 64 + 16 = 80
16 + -8x + x2 = 80

Factor a perfect square on the left side:
(x + -4)(x + -4) = 80

Calculate the square root of the right side: 8.94427191

Break this problem into two subproblems by setting 
(x + -4) equal to 8.94427191 and -8.94427191.

Subproblem 1

x + -4 = 8.94427191 Simplifying x + -4 = 8.94427191 Reorder the terms: -4 + x = 8.94427191 Solving -4 + x = 8.94427191 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 = 8.94427191 + 4 Combine like terms: -4 + 4 = 0 0 + x = 8.94427191 + 4 x = 8.94427191 + 4 Combine like terms: 8.94427191 + 4 = 12.94427191 x = 12.94427191 Simplifying x = 12.94427191

Subproblem 2

x + -4 = -8.94427191 Simplifying x + -4 = -8.94427191 Reorder the terms: -4 + x = -8.94427191 Solving -4 + x = -8.94427191 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 = -8.94427191 + 4 Combine like terms: -4 + 4 = 0 0 + x = -8.94427191 + 4 x = -8.94427191 + 4 Combine like terms: -8.94427191 + 4 = -4.94427191 x = -4.94427191 Simplifying x = -4.94427191

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.94427191, -4.94427191}

See similar equations:

| 15=p-22 | | 0=3X^3-2X^2-4X+7 | | 3(x-3)-14=2(x-7)+10 | | 8=y+33 | | -11-6x=13x+24 | | 24+x=43 | | 2x-2=9x-6 | | y-23=7 | | 46x-1=36x | | 12x-152=5x-5 | | 46(x-1)=36x | | x+(x+11)=150 | | 8-10x=128-38x | | p+9=3 | | 113-7x=29x+17 | | 11-8x=111-36x | | 2x+8=112-10x | | 120-4x=6x+10 | | v-8=-6 | | x+4y=54 | | 20x^2-24x=0 | | 5x^2-31x-72=0 | | 12x^2+27x=0 | | 16x^2-81=0 | | 4x^2-72=5x^2+18x | | 9+r=-8 | | 5x-5=12x+82 | | 2x+38=9x-25 | | 9x^2-3-10x^2+13+7x= | | 7x-4=x+2 | | 73-7x=2x+21 | | 0.2x+7.3=6.6 |

Equations solver categories