2x-9=-8x(5+5x)

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Solution for 2x-9=-8x(5+5x) equation:


Simplifying
2x + -9 = -8x(5 + 5x)

Reorder the terms:
-9 + 2x = -8x(5 + 5x)
-9 + 2x = (5 * -8x + 5x * -8x)
-9 + 2x = (-40x + -40x2)

Solving
-9 + 2x = -40x + -40x2

Solving for variable 'x'.

Combine like terms: 2x + 40x = 42x
-9 + 42x + 40x2 = -40x + -40x2 + 40x + 40x2

Reorder the terms:
-9 + 42x + 40x2 = -40x + 40x + -40x2 + 40x2

Combine like terms: -40x + 40x = 0
-9 + 42x + 40x2 = 0 + -40x2 + 40x2
-9 + 42x + 40x2 = -40x2 + 40x2

Combine like terms: -40x2 + 40x2 = 0
-9 + 42x + 40x2 = 0

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

Divide each side by '40'.
-0.225 + 1.05x + x2 = 0

Move the constant term to the right:

Add '0.225' to each side of the equation.
-0.225 + 1.05x + 0.225 + x2 = 0 + 0.225

Reorder the terms:
-0.225 + 0.225 + 1.05x + x2 = 0 + 0.225

Combine like terms: -0.225 + 0.225 = 0.000
0.000 + 1.05x + x2 = 0 + 0.225
1.05x + x2 = 0 + 0.225

Combine like terms: 0 + 0.225 = 0.225
1.05x + x2 = 0.225

The x term is 1.05x.  Take half its coefficient (0.525).
Square it (0.275625) and add it to both sides.

Add '0.275625' to each side of the equation.
1.05x + 0.275625 + x2 = 0.225 + 0.275625

Reorder the terms:
0.275625 + 1.05x + x2 = 0.225 + 0.275625

Combine like terms: 0.225 + 0.275625 = 0.500625
0.275625 + 1.05x + x2 = 0.500625

Factor a perfect square on the left side:
(x + 0.525)(x + 0.525) = 0.500625

Calculate the square root of the right side: 0.707548585

Break this problem into two subproblems by setting 
(x + 0.525) equal to 0.707548585 and -0.707548585.

Subproblem 1

x + 0.525 = 0.707548585 Simplifying x + 0.525 = 0.707548585 Reorder the terms: 0.525 + x = 0.707548585 Solving 0.525 + x = 0.707548585 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.525' to each side of the equation. 0.525 + -0.525 + x = 0.707548585 + -0.525 Combine like terms: 0.525 + -0.525 = 0.000 0.000 + x = 0.707548585 + -0.525 x = 0.707548585 + -0.525 Combine like terms: 0.707548585 + -0.525 = 0.182548585 x = 0.182548585 Simplifying x = 0.182548585

Subproblem 2

x + 0.525 = -0.707548585 Simplifying x + 0.525 = -0.707548585 Reorder the terms: 0.525 + x = -0.707548585 Solving 0.525 + x = -0.707548585 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.525' to each side of the equation. 0.525 + -0.525 + x = -0.707548585 + -0.525 Combine like terms: 0.525 + -0.525 = 0.000 0.000 + x = -0.707548585 + -0.525 x = -0.707548585 + -0.525 Combine like terms: -0.707548585 + -0.525 = -1.232548585 x = -1.232548585 Simplifying x = -1.232548585

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.182548585, -1.232548585}

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