-10x(4-10x-9)-7x=1

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Solution for -10x(4-10x-9)-7x=1 equation:


Simplifying
-10x(4 + -10x + -9) + -7x = 1

Reorder the terms:
-10x(4 + -9 + -10x) + -7x = 1

Combine like terms: 4 + -9 = -5
-10x(-5 + -10x) + -7x = 1
(-5 * -10x + -10x * -10x) + -7x = 1
(50x + 100x2) + -7x = 1

Reorder the terms:
50x + -7x + 100x2 = 1

Combine like terms: 50x + -7x = 43x
43x + 100x2 = 1

Solving
43x + 100x2 = 1

Solving for variable 'x'.

Reorder the terms:
-1 + 43x + 100x2 = 1 + -1

Combine like terms: 1 + -1 = 0
-1 + 43x + 100x2 = 0

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

Divide each side by '100'.
-0.01 + 0.43x + x2 = 0.00

Move the constant term to the right:

Add '0.01' to each side of the equation.
-0.01 + 0.43x + 0.01 + x2 = 0.00 + 0.01

Reorder the terms:
-0.01 + 0.01 + 0.43x + x2 = 0.00 + 0.01

Combine like terms: -0.01 + 0.01 = 0.00
0.00 + 0.43x + x2 = 0.00 + 0.01
0.43x + x2 = 0.00 + 0.01

Combine like terms: 0.00 + 0.01 = 0.01
0.43x + x2 = 0.01

The x term is 0.43x.  Take half its coefficient (0.215).
Square it (0.046225) and add it to both sides.

Add '0.046225' to each side of the equation.
0.43x + 0.046225 + x2 = 0.01 + 0.046225

Reorder the terms:
0.046225 + 0.43x + x2 = 0.01 + 0.046225

Combine like terms: 0.01 + 0.046225 = 0.056225
0.046225 + 0.43x + x2 = 0.056225

Factor a perfect square on the left side:
(x + 0.215)(x + 0.215) = 0.056225

Calculate the square root of the right side: 0.237118114

Break this problem into two subproblems by setting 
(x + 0.215) equal to 0.237118114 and -0.237118114.

Subproblem 1

x + 0.215 = 0.237118114 Simplifying x + 0.215 = 0.237118114 Reorder the terms: 0.215 + x = 0.237118114 Solving 0.215 + x = 0.237118114 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.215' to each side of the equation. 0.215 + -0.215 + x = 0.237118114 + -0.215 Combine like terms: 0.215 + -0.215 = 0.000 0.000 + x = 0.237118114 + -0.215 x = 0.237118114 + -0.215 Combine like terms: 0.237118114 + -0.215 = 0.022118114 x = 0.022118114 Simplifying x = 0.022118114

Subproblem 2

x + 0.215 = -0.237118114 Simplifying x + 0.215 = -0.237118114 Reorder the terms: 0.215 + x = -0.237118114 Solving 0.215 + x = -0.237118114 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.215' to each side of the equation. 0.215 + -0.215 + x = -0.237118114 + -0.215 Combine like terms: 0.215 + -0.215 = 0.000 0.000 + x = -0.237118114 + -0.215 x = -0.237118114 + -0.215 Combine like terms: -0.237118114 + -0.215 = -0.452118114 x = -0.452118114 Simplifying x = -0.452118114

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.022118114, -0.452118114}

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