(10x-1)x=30

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Solution for (10x-1)x=30 equation:


Simplifying
(10x + -1) * x = 30

Reorder the terms:
(-1 + 10x) * x = 30

Reorder the terms for easier multiplication:
x(-1 + 10x) = 30
(-1 * x + 10x * x) = 30
(-1x + 10x2) = 30

Solving
-1x + 10x2 = 30

Solving for variable 'x'.

Reorder the terms:
-30 + -1x + 10x2 = 30 + -30

Combine like terms: 30 + -30 = 0
-30 + -1x + 10x2 = 0

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

Divide each side by '10'.
-3 + -0.1x + x2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + -0.1x + 3 + x2 = 0 + 3

Reorder the terms:
-3 + 3 + -0.1x + x2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + -0.1x + x2 = 0 + 3
-0.1x + x2 = 0 + 3

Combine like terms: 0 + 3 = 3
-0.1x + x2 = 3

The x term is -0.1x.  Take half its coefficient (-0.05).
Square it (0.0025) and add it to both sides.

Add '0.0025' to each side of the equation.
-0.1x + 0.0025 + x2 = 3 + 0.0025

Reorder the terms:
0.0025 + -0.1x + x2 = 3 + 0.0025

Combine like terms: 3 + 0.0025 = 3.0025
0.0025 + -0.1x + x2 = 3.0025

Factor a perfect square on the left side:
(x + -0.05)(x + -0.05) = 3.0025

Calculate the square root of the right side: 1.732772345

Break this problem into two subproblems by setting 
(x + -0.05) equal to 1.732772345 and -1.732772345.

Subproblem 1

x + -0.05 = 1.732772345 Simplifying x + -0.05 = 1.732772345 Reorder the terms: -0.05 + x = 1.732772345 Solving -0.05 + x = 1.732772345 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.05' to each side of the equation. -0.05 + 0.05 + x = 1.732772345 + 0.05 Combine like terms: -0.05 + 0.05 = 0.00 0.00 + x = 1.732772345 + 0.05 x = 1.732772345 + 0.05 Combine like terms: 1.732772345 + 0.05 = 1.782772345 x = 1.782772345 Simplifying x = 1.782772345

Subproblem 2

x + -0.05 = -1.732772345 Simplifying x + -0.05 = -1.732772345 Reorder the terms: -0.05 + x = -1.732772345 Solving -0.05 + x = -1.732772345 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.05' to each side of the equation. -0.05 + 0.05 + x = -1.732772345 + 0.05 Combine like terms: -0.05 + 0.05 = 0.00 0.00 + x = -1.732772345 + 0.05 x = -1.732772345 + 0.05 Combine like terms: -1.732772345 + 0.05 = -1.682772345 x = -1.682772345 Simplifying x = -1.682772345

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.782772345, -1.682772345}

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