8(2x+6)8x=12x+15

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Solution for 8(2x+6)8x=12x+15 equation:


Simplifying
8(2x + 6) * 8x = 12x + 15

Reorder the terms:
8(6 + 2x) * 8x = 12x + 15

Reorder the terms for easier multiplication:
8 * 8x(6 + 2x) = 12x + 15

Multiply 8 * 8
64x(6 + 2x) = 12x + 15
(6 * 64x + 2x * 64x) = 12x + 15
(384x + 128x2) = 12x + 15

Reorder the terms:
384x + 128x2 = 15 + 12x

Solving
384x + 128x2 = 15 + 12x

Solving for variable 'x'.

Reorder the terms:
-15 + 384x + -12x + 128x2 = 15 + 12x + -15 + -12x

Combine like terms: 384x + -12x = 372x
-15 + 372x + 128x2 = 15 + 12x + -15 + -12x

Reorder the terms:
-15 + 372x + 128x2 = 15 + -15 + 12x + -12x

Combine like terms: 15 + -15 = 0
-15 + 372x + 128x2 = 0 + 12x + -12x
-15 + 372x + 128x2 = 12x + -12x

Combine like terms: 12x + -12x = 0
-15 + 372x + 128x2 = 0

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

Divide each side by '128'.
-0.1171875 + 2.90625x + x2 = 0

Move the constant term to the right:

Add '0.1171875' to each side of the equation.
-0.1171875 + 2.90625x + 0.1171875 + x2 = 0 + 0.1171875

Reorder the terms:
-0.1171875 + 0.1171875 + 2.90625x + x2 = 0 + 0.1171875

Combine like terms: -0.1171875 + 0.1171875 = 0.0000000
0.0000000 + 2.90625x + x2 = 0 + 0.1171875
2.90625x + x2 = 0 + 0.1171875

Combine like terms: 0 + 0.1171875 = 0.1171875
2.90625x + x2 = 0.1171875

The x term is 2.90625x.  Take half its coefficient (1.453125).
Square it (2.111572266) and add it to both sides.

Add '2.111572266' to each side of the equation.
2.90625x + 2.111572266 + x2 = 0.1171875 + 2.111572266

Reorder the terms:
2.111572266 + 2.90625x + x2 = 0.1171875 + 2.111572266

Combine like terms: 0.1171875 + 2.111572266 = 2.228759766
2.111572266 + 2.90625x + x2 = 2.228759766

Factor a perfect square on the left side:
(x + 1.453125)(x + 1.453125) = 2.228759766

Calculate the square root of the right side: 1.492903133

Break this problem into two subproblems by setting 
(x + 1.453125) equal to 1.492903133 and -1.492903133.

Subproblem 1

x + 1.453125 = 1.492903133 Simplifying x + 1.453125 = 1.492903133 Reorder the terms: 1.453125 + x = 1.492903133 Solving 1.453125 + x = 1.492903133 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.453125' to each side of the equation. 1.453125 + -1.453125 + x = 1.492903133 + -1.453125 Combine like terms: 1.453125 + -1.453125 = 0.000000 0.000000 + x = 1.492903133 + -1.453125 x = 1.492903133 + -1.453125 Combine like terms: 1.492903133 + -1.453125 = 0.039778133 x = 0.039778133 Simplifying x = 0.039778133

Subproblem 2

x + 1.453125 = -1.492903133 Simplifying x + 1.453125 = -1.492903133 Reorder the terms: 1.453125 + x = -1.492903133 Solving 1.453125 + x = -1.492903133 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.453125' to each side of the equation. 1.453125 + -1.453125 + x = -1.492903133 + -1.453125 Combine like terms: 1.453125 + -1.453125 = 0.000000 0.000000 + x = -1.492903133 + -1.453125 x = -1.492903133 + -1.453125 Combine like terms: -1.492903133 + -1.453125 = -2.946028133 x = -2.946028133 Simplifying x = -2.946028133

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.039778133, -2.946028133}

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