8x(2x+3)=-1

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Solution for 8x(2x+3)=-1 equation:


Simplifying
8x(2x + 3) = -1

Reorder the terms:
8x(3 + 2x) = -1
(3 * 8x + 2x * 8x) = -1
(24x + 16x2) = -1

Solving
24x + 16x2 = -1

Solving for variable 'x'.

Reorder the terms:
1 + 24x + 16x2 = -1 + 1

Combine like terms: -1 + 1 = 0
1 + 24x + 16x2 = 0

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

Divide each side by '16'.
0.0625 + 1.5x + x2 = 0

Move the constant term to the right:

Add '-0.0625' to each side of the equation.
0.0625 + 1.5x + -0.0625 + x2 = 0 + -0.0625

Reorder the terms:
0.0625 + -0.0625 + 1.5x + x2 = 0 + -0.0625

Combine like terms: 0.0625 + -0.0625 = 0.0000
0.0000 + 1.5x + x2 = 0 + -0.0625
1.5x + x2 = 0 + -0.0625

Combine like terms: 0 + -0.0625 = -0.0625
1.5x + x2 = -0.0625

The x term is 1.5x.  Take half its coefficient (0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
1.5x + 0.5625 + x2 = -0.0625 + 0.5625

Reorder the terms:
0.5625 + 1.5x + x2 = -0.0625 + 0.5625

Combine like terms: -0.0625 + 0.5625 = 0.5
0.5625 + 1.5x + x2 = 0.5

Factor a perfect square on the left side:
(x + 0.75)(x + 0.75) = 0.5

Calculate the square root of the right side: 0.707106781

Break this problem into two subproblems by setting 
(x + 0.75) equal to 0.707106781 and -0.707106781.

Subproblem 1

x + 0.75 = 0.707106781 Simplifying x + 0.75 = 0.707106781 Reorder the terms: 0.75 + x = 0.707106781 Solving 0.75 + x = 0.707106781 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = 0.707106781 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = 0.707106781 + -0.75 x = 0.707106781 + -0.75 Combine like terms: 0.707106781 + -0.75 = -0.042893219 x = -0.042893219 Simplifying x = -0.042893219

Subproblem 2

x + 0.75 = -0.707106781 Simplifying x + 0.75 = -0.707106781 Reorder the terms: 0.75 + x = -0.707106781 Solving 0.75 + x = -0.707106781 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = -0.707106781 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = -0.707106781 + -0.75 x = -0.707106781 + -0.75 Combine like terms: -0.707106781 + -0.75 = -1.457106781 x = -1.457106781 Simplifying x = -1.457106781

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.042893219, -1.457106781}

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