13x-10x*10x=0.4

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Solution for 13x-10x*10x=0.4 equation:


Simplifying
13x + -10x * 10x = 0.4

Reorder the terms for easier multiplication:
13x + -10 * 10x * x = 0.4

Multiply -10 * 10
13x + -100x * x = 0.4

Multiply x * x
13x + -100x2 = 0.4

Solving
13x + -100x2 = 0.4

Solving for variable 'x'.

Reorder the terms:
-0.4 + 13x + -100x2 = 0.4 + -0.4

Combine like terms: 0.4 + -0.4 = 0.0
-0.4 + 13x + -100x2 = 0.0

Begin completing the square.  Divide all terms by
-100 the coefficient of the squared term: 

Divide each side by '-100'.
0.004 + -0.13x + x2 = 0.000

Move the constant term to the right:

Add '-0.004' to each side of the equation.
0.004 + -0.13x + -0.004 + x2 = 0.000 + -0.004

Reorder the terms:
0.004 + -0.004 + -0.13x + x2 = 0.000 + -0.004

Combine like terms: 0.004 + -0.004 = 0.000
0.000 + -0.13x + x2 = 0.000 + -0.004
-0.13x + x2 = 0.000 + -0.004

Combine like terms: 0.000 + -0.004 = -0.004
-0.13x + x2 = -0.004

The x term is -0.13x.  Take half its coefficient (-0.065).
Square it (0.004225) and add it to both sides.

Add '0.004225' to each side of the equation.
-0.13x + 0.004225 + x2 = -0.004 + 0.004225

Reorder the terms:
0.004225 + -0.13x + x2 = -0.004 + 0.004225

Combine like terms: -0.004 + 0.004225 = 0.000225
0.004225 + -0.13x + x2 = 0.000225

Factor a perfect square on the left side:
(x + -0.065)(x + -0.065) = 0.000225

Calculate the square root of the right side: 0.015

Break this problem into two subproblems by setting 
(x + -0.065) equal to 0.015 and -0.015.

Subproblem 1

x + -0.065 = 0.015 Simplifying x + -0.065 = 0.015 Reorder the terms: -0.065 + x = 0.015 Solving -0.065 + x = 0.015 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.065' to each side of the equation. -0.065 + 0.065 + x = 0.015 + 0.065 Combine like terms: -0.065 + 0.065 = 0.000 0.000 + x = 0.015 + 0.065 x = 0.015 + 0.065 Combine like terms: 0.015 + 0.065 = 0.08 x = 0.08 Simplifying x = 0.08

Subproblem 2

x + -0.065 = -0.015 Simplifying x + -0.065 = -0.015 Reorder the terms: -0.065 + x = -0.015 Solving -0.065 + x = -0.015 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.065' to each side of the equation. -0.065 + 0.065 + x = -0.015 + 0.065 Combine like terms: -0.065 + 0.065 = 0.000 0.000 + x = -0.015 + 0.065 x = -0.015 + 0.065 Combine like terms: -0.015 + 0.065 = 0.05 x = 0.05 Simplifying x = 0.05

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.08, 0.05}

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