x^2-8x=64

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


Simplifying
x2 + -8x = 64

Reorder the terms:
-8x + x2 = 64

Solving
-8x + x2 = 64

Solving for variable 'x'.

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

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

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:

| 4x+17=14x-63 | | -2n+6=-6(4n-1) | | 2x+20=52-6x | | 7[-5x-6-5(x+1)]=5x+6 | | 6y+11=2y+59 | | -6(t^2+3)-2(t^2-2)= | | 6(b+9)= | | x^3+2x^2+3x=-6 | | -8x+6(x+8)=36 | | 12=x+4+7x | | 3(1-4x)=-21-6x | | -3(2w-5)=1-4w | | 25x^2+35x=-12 | | -4(2k-3)=4-10k | | 5x+6=30 | | 5(u-7)-7u=-19 | | 2(5x-3)=9x | | 4x-5=x+22 | | 2k+10=7k+5 | | -2+6x=2x-1 | | 7x-13=53-4x | | 9=-3n+6n | | 5x-4(x-7)=3+2x | | 4(a+6)=6+a | | 7x-14=53-4x | | w+21=-5w-33 | | 2x+75000=55000000 | | 8y-9=18+5y | | -5x=-7.5 | | 4y+2=2y-6 | | 3x^2-1=7x | | 10p-63=7+3p |

Equations solver categories