5x(x-8)=172

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Solution for 5x(x-8)=172 equation:


Simplifying
5x(x + -8) = 172

Reorder the terms:
5x(-8 + x) = 172
(-8 * 5x + x * 5x) = 172
(-40x + 5x2) = 172

Solving
-40x + 5x2 = 172

Solving for variable 'x'.

Reorder the terms:
-172 + -40x + 5x2 = 172 + -172

Combine like terms: 172 + -172 = 0
-172 + -40x + 5x2 = 0

Begin completing the square.  Divide all terms by
5 the coefficient of the squared term: 

Divide each side by '5'.
-34.4 + -8x + x2 = 0

Move the constant term to the right:

Add '34.4' to each side of the equation.
-34.4 + -8x + 34.4 + x2 = 0 + 34.4

Reorder the terms:
-34.4 + 34.4 + -8x + x2 = 0 + 34.4

Combine like terms: -34.4 + 34.4 = 0.0
0.0 + -8x + x2 = 0 + 34.4
-8x + x2 = 0 + 34.4

Combine like terms: 0 + 34.4 = 34.4
-8x + x2 = 34.4

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 = 34.4 + 16

Reorder the terms:
16 + -8x + x2 = 34.4 + 16

Combine like terms: 34.4 + 16 = 50.4
16 + -8x + x2 = 50.4

Factor a perfect square on the left side:
(x + -4)(x + -4) = 50.4

Calculate the square root of the right side: 7.09929574

Break this problem into two subproblems by setting 
(x + -4) equal to 7.09929574 and -7.09929574.

Subproblem 1

x + -4 = 7.09929574 Simplifying x + -4 = 7.09929574 Reorder the terms: -4 + x = 7.09929574 Solving -4 + x = 7.09929574 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 = 7.09929574 + 4 Combine like terms: -4 + 4 = 0 0 + x = 7.09929574 + 4 x = 7.09929574 + 4 Combine like terms: 7.09929574 + 4 = 11.09929574 x = 11.09929574 Simplifying x = 11.09929574

Subproblem 2

x + -4 = -7.09929574 Simplifying x + -4 = -7.09929574 Reorder the terms: -4 + x = -7.09929574 Solving -4 + x = -7.09929574 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 = -7.09929574 + 4 Combine like terms: -4 + 4 = 0 0 + x = -7.09929574 + 4 x = -7.09929574 + 4 Combine like terms: -7.09929574 + 4 = -3.09929574 x = -3.09929574 Simplifying x = -3.09929574

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.09929574, -3.09929574}

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