9x-2x(x+4)=-29

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Solution for 9x-2x(x+4)=-29 equation:


Simplifying
9x + -2x(x + 4) = -29

Reorder the terms:
9x + -2x(4 + x) = -29
9x + (4 * -2x + x * -2x) = -29
9x + (-8x + -2x2) = -29

Combine like terms: 9x + -8x = 1x
1x + -2x2 = -29

Solving
1x + -2x2 = -29

Solving for variable 'x'.

Reorder the terms:
29 + 1x + -2x2 = -29 + 29

Combine like terms: -29 + 29 = 0
29 + 1x + -2x2 = 0

Begin completing the square.  Divide all terms by
-2 the coefficient of the squared term: 

Divide each side by '-2'.
-14.5 + -0.5x + x2 = 0

Move the constant term to the right:

Add '14.5' to each side of the equation.
-14.5 + -0.5x + 14.5 + x2 = 0 + 14.5

Reorder the terms:
-14.5 + 14.5 + -0.5x + x2 = 0 + 14.5

Combine like terms: -14.5 + 14.5 = 0.0
0.0 + -0.5x + x2 = 0 + 14.5
-0.5x + x2 = 0 + 14.5

Combine like terms: 0 + 14.5 = 14.5
-0.5x + x2 = 14.5

The x term is -0.5x.  Take half its coefficient (-0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
-0.5x + 0.0625 + x2 = 14.5 + 0.0625

Reorder the terms:
0.0625 + -0.5x + x2 = 14.5 + 0.0625

Combine like terms: 14.5 + 0.0625 = 14.5625
0.0625 + -0.5x + x2 = 14.5625

Factor a perfect square on the left side:
(x + -0.25)(x + -0.25) = 14.5625

Calculate the square root of the right side: 3.816084381

Break this problem into two subproblems by setting 
(x + -0.25) equal to 3.816084381 and -3.816084381.

Subproblem 1

x + -0.25 = 3.816084381 Simplifying x + -0.25 = 3.816084381 Reorder the terms: -0.25 + x = 3.816084381 Solving -0.25 + x = 3.816084381 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + x = 3.816084381 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = 3.816084381 + 0.25 x = 3.816084381 + 0.25 Combine like terms: 3.816084381 + 0.25 = 4.066084381 x = 4.066084381 Simplifying x = 4.066084381

Subproblem 2

x + -0.25 = -3.816084381 Simplifying x + -0.25 = -3.816084381 Reorder the terms: -0.25 + x = -3.816084381 Solving -0.25 + x = -3.816084381 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + x = -3.816084381 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = -3.816084381 + 0.25 x = -3.816084381 + 0.25 Combine like terms: -3.816084381 + 0.25 = -3.566084381 x = -3.566084381 Simplifying x = -3.566084381

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.066084381, -3.566084381}

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