0.5(5+7x)=8x(4x+6)

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Solution for 0.5(5+7x)=8x(4x+6) equation:


Simplifying
0.5(5 + 7x) = 8x(4x + 6)
(5 * 0.5 + 7x * 0.5) = 8x(4x + 6)
(2.5 + 3.5x) = 8x(4x + 6)

Reorder the terms:
2.5 + 3.5x = 8x(6 + 4x)
2.5 + 3.5x = (6 * 8x + 4x * 8x)
2.5 + 3.5x = (48x + 32x2)

Solving
2.5 + 3.5x = 48x + 32x2

Solving for variable 'x'.

Combine like terms: 3.5x + -48x = -44.5x
2.5 + -44.5x + -32x2 = 48x + 32x2 + -48x + -32x2

Reorder the terms:
2.5 + -44.5x + -32x2 = 48x + -48x + 32x2 + -32x2

Combine like terms: 48x + -48x = 0
2.5 + -44.5x + -32x2 = 0 + 32x2 + -32x2
2.5 + -44.5x + -32x2 = 32x2 + -32x2

Combine like terms: 32x2 + -32x2 = 0
2.5 + -44.5x + -32x2 = 0

Begin completing the square.  Divide all terms by
-32 the coefficient of the squared term: 

Divide each side by '-32'.
-0.078125 + 1.390625x + x2 = 0

Move the constant term to the right:

Add '0.078125' to each side of the equation.
-0.078125 + 1.390625x + 0.078125 + x2 = 0 + 0.078125

Reorder the terms:
-0.078125 + 0.078125 + 1.390625x + x2 = 0 + 0.078125

Combine like terms: -0.078125 + 0.078125 = 0.000000
0.000000 + 1.390625x + x2 = 0 + 0.078125
1.390625x + x2 = 0 + 0.078125

Combine like terms: 0 + 0.078125 = 0.078125
1.390625x + x2 = 0.078125

The x term is 1.390625x.  Take half its coefficient (0.6953125).
Square it (0.4834594727) and add it to both sides.

Add '0.4834594727' to each side of the equation.
1.390625x + 0.4834594727 + x2 = 0.078125 + 0.4834594727

Reorder the terms:
0.4834594727 + 1.390625x + x2 = 0.078125 + 0.4834594727

Combine like terms: 0.078125 + 0.4834594727 = 0.5615844727
0.4834594727 + 1.390625x + x2 = 0.5615844727

Factor a perfect square on the left side:
(x + 0.6953125)(x + 0.6953125) = 0.5615844727

Calculate the square root of the right side: 0.7493894

Break this problem into two subproblems by setting 
(x + 0.6953125) equal to 0.7493894 and -0.7493894.

Subproblem 1

x + 0.6953125 = 0.7493894 Simplifying x + 0.6953125 = 0.7493894 Reorder the terms: 0.6953125 + x = 0.7493894 Solving 0.6953125 + x = 0.7493894 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.6953125' to each side of the equation. 0.6953125 + -0.6953125 + x = 0.7493894 + -0.6953125 Combine like terms: 0.6953125 + -0.6953125 = 0.0000000 0.0000000 + x = 0.7493894 + -0.6953125 x = 0.7493894 + -0.6953125 Combine like terms: 0.7493894 + -0.6953125 = 0.0540769 x = 0.0540769 Simplifying x = 0.0540769

Subproblem 2

x + 0.6953125 = -0.7493894 Simplifying x + 0.6953125 = -0.7493894 Reorder the terms: 0.6953125 + x = -0.7493894 Solving 0.6953125 + x = -0.7493894 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.6953125' to each side of the equation. 0.6953125 + -0.6953125 + x = -0.7493894 + -0.6953125 Combine like terms: 0.6953125 + -0.6953125 = 0.0000000 0.0000000 + x = -0.7493894 + -0.6953125 x = -0.7493894 + -0.6953125 Combine like terms: -0.7493894 + -0.6953125 = -1.4447019 x = -1.4447019 Simplifying x = -1.4447019

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.0540769, -1.4447019}

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