x*(x-8)=160

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Solution for x*(x-8)=160 equation:


Simplifying
x(x + -8) = 160

Reorder the terms:
x(-8 + x) = 160
(-8 * x + x * x) = 160
(-8x + x2) = 160

Solving
-8x + x2 = 160

Solving for variable 'x'.

Reorder the terms:
-160 + -8x + x2 = 160 + -160

Combine like terms: 160 + -160 = 0
-160 + -8x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '160' to each side of the equation.
-160 + -8x + 160 + x2 = 0 + 160

Reorder the terms:
-160 + 160 + -8x + x2 = 0 + 160

Combine like terms: -160 + 160 = 0
0 + -8x + x2 = 0 + 160
-8x + x2 = 0 + 160

Combine like terms: 0 + 160 = 160
-8x + x2 = 160

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 = 160 + 16

Reorder the terms:
16 + -8x + x2 = 160 + 16

Combine like terms: 160 + 16 = 176
16 + -8x + x2 = 176

Factor a perfect square on the left side:
(x + -4)(x + -4) = 176

Calculate the square root of the right side: 13.266499161

Break this problem into two subproblems by setting 
(x + -4) equal to 13.266499161 and -13.266499161.

Subproblem 1

x + -4 = 13.266499161 Simplifying x + -4 = 13.266499161 Reorder the terms: -4 + x = 13.266499161 Solving -4 + x = 13.266499161 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 = 13.266499161 + 4 Combine like terms: -4 + 4 = 0 0 + x = 13.266499161 + 4 x = 13.266499161 + 4 Combine like terms: 13.266499161 + 4 = 17.266499161 x = 17.266499161 Simplifying x = 17.266499161

Subproblem 2

x + -4 = -13.266499161 Simplifying x + -4 = -13.266499161 Reorder the terms: -4 + x = -13.266499161 Solving -4 + x = -13.266499161 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 = -13.266499161 + 4 Combine like terms: -4 + 4 = 0 0 + x = -13.266499161 + 4 x = -13.266499161 + 4 Combine like terms: -13.266499161 + 4 = -9.266499161 x = -9.266499161 Simplifying x = -9.266499161

Solution

The solution to the problem is based on the solutions from the subproblems. x = {17.266499161, -9.266499161}

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