15x-10=4-100x(4x-7)

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Solution for 15x-10=4-100x(4x-7) equation:


Simplifying
15x + -10 = 4 + -100x(4x + -7)

Reorder the terms:
-10 + 15x = 4 + -100x(4x + -7)

Reorder the terms:
-10 + 15x = 4 + -100x(-7 + 4x)
-10 + 15x = 4 + (-7 * -100x + 4x * -100x)
-10 + 15x = 4 + (700x + -400x2)

Solving
-10 + 15x = 4 + 700x + -400x2

Solving for variable 'x'.

Reorder the terms:
-10 + -4 + 15x + -700x + 400x2 = 4 + 700x + -400x2 + -4 + -700x + 400x2

Combine like terms: -10 + -4 = -14
-14 + 15x + -700x + 400x2 = 4 + 700x + -400x2 + -4 + -700x + 400x2

Combine like terms: 15x + -700x = -685x
-14 + -685x + 400x2 = 4 + 700x + -400x2 + -4 + -700x + 400x2

Reorder the terms:
-14 + -685x + 400x2 = 4 + -4 + 700x + -700x + -400x2 + 400x2

Combine like terms: 4 + -4 = 0
-14 + -685x + 400x2 = 0 + 700x + -700x + -400x2 + 400x2
-14 + -685x + 400x2 = 700x + -700x + -400x2 + 400x2

Combine like terms: 700x + -700x = 0
-14 + -685x + 400x2 = 0 + -400x2 + 400x2
-14 + -685x + 400x2 = -400x2 + 400x2

Combine like terms: -400x2 + 400x2 = 0
-14 + -685x + 400x2 = 0

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

Divide each side by '400'.
-0.035 + -1.7125x + x2 = 0

Move the constant term to the right:

Add '0.035' to each side of the equation.
-0.035 + -1.7125x + 0.035 + x2 = 0 + 0.035

Reorder the terms:
-0.035 + 0.035 + -1.7125x + x2 = 0 + 0.035

Combine like terms: -0.035 + 0.035 = 0.000
0.000 + -1.7125x + x2 = 0 + 0.035
-1.7125x + x2 = 0 + 0.035

Combine like terms: 0 + 0.035 = 0.035
-1.7125x + x2 = 0.035

The x term is -1.7125x.  Take half its coefficient (-0.85625).
Square it (0.7331640625) and add it to both sides.

Add '0.7331640625' to each side of the equation.
-1.7125x + 0.7331640625 + x2 = 0.035 + 0.7331640625

Reorder the terms:
0.7331640625 + -1.7125x + x2 = 0.035 + 0.7331640625

Combine like terms: 0.035 + 0.7331640625 = 0.7681640625
0.7331640625 + -1.7125x + x2 = 0.7681640625

Factor a perfect square on the left side:
(x + -0.85625)(x + -0.85625) = 0.7681640625

Calculate the square root of the right side: 0.876449692

Break this problem into two subproblems by setting 
(x + -0.85625) equal to 0.876449692 and -0.876449692.

Subproblem 1

x + -0.85625 = 0.876449692 Simplifying x + -0.85625 = 0.876449692 Reorder the terms: -0.85625 + x = 0.876449692 Solving -0.85625 + x = 0.876449692 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.85625' to each side of the equation. -0.85625 + 0.85625 + x = 0.876449692 + 0.85625 Combine like terms: -0.85625 + 0.85625 = 0.00000 0.00000 + x = 0.876449692 + 0.85625 x = 0.876449692 + 0.85625 Combine like terms: 0.876449692 + 0.85625 = 1.732699692 x = 1.732699692 Simplifying x = 1.732699692

Subproblem 2

x + -0.85625 = -0.876449692 Simplifying x + -0.85625 = -0.876449692 Reorder the terms: -0.85625 + x = -0.876449692 Solving -0.85625 + x = -0.876449692 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.85625' to each side of the equation. -0.85625 + 0.85625 + x = -0.876449692 + 0.85625 Combine like terms: -0.85625 + 0.85625 = 0.00000 0.00000 + x = -0.876449692 + 0.85625 x = -0.876449692 + 0.85625 Combine like terms: -0.876449692 + 0.85625 = -0.020199692 x = -0.020199692 Simplifying x = -0.020199692

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.732699692, -0.020199692}

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