0=8x^2+126x-35

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Solution for 0=8x^2+126x-35 equation:


Simplifying
0 = 8x2 + 126x + -35

Reorder the terms:
0 = -35 + 126x + 8x2

Solving
0 = -35 + 126x + 8x2

Solving for variable 'x'.

Combine like terms: 0 + 35 = 35
35 + -126x + -8x2 = -35 + 126x + 8x2 + 35 + -126x + -8x2

Reorder the terms:
35 + -126x + -8x2 = -35 + 35 + 126x + -126x + 8x2 + -8x2

Combine like terms: -35 + 35 = 0
35 + -126x + -8x2 = 0 + 126x + -126x + 8x2 + -8x2
35 + -126x + -8x2 = 126x + -126x + 8x2 + -8x2

Combine like terms: 126x + -126x = 0
35 + -126x + -8x2 = 0 + 8x2 + -8x2
35 + -126x + -8x2 = 8x2 + -8x2

Combine like terms: 8x2 + -8x2 = 0
35 + -126x + -8x2 = 0

Begin completing the square.  Divide all terms by
-8 the coefficient of the squared term: 

Divide each side by '-8'.
-4.375 + 15.75x + x2 = 0

Move the constant term to the right:

Add '4.375' to each side of the equation.
-4.375 + 15.75x + 4.375 + x2 = 0 + 4.375

Reorder the terms:
-4.375 + 4.375 + 15.75x + x2 = 0 + 4.375

Combine like terms: -4.375 + 4.375 = 0.000
0.000 + 15.75x + x2 = 0 + 4.375
15.75x + x2 = 0 + 4.375

Combine like terms: 0 + 4.375 = 4.375
15.75x + x2 = 4.375

The x term is 15.75x.  Take half its coefficient (7.875).
Square it (62.015625) and add it to both sides.

Add '62.015625' to each side of the equation.
15.75x + 62.015625 + x2 = 4.375 + 62.015625

Reorder the terms:
62.015625 + 15.75x + x2 = 4.375 + 62.015625

Combine like terms: 4.375 + 62.015625 = 66.390625
62.015625 + 15.75x + x2 = 66.390625

Factor a perfect square on the left side:
(x + 7.875)(x + 7.875) = 66.390625

Calculate the square root of the right side: 8.148044244

Break this problem into two subproblems by setting 
(x + 7.875) equal to 8.148044244 and -8.148044244.

Subproblem 1

x + 7.875 = 8.148044244 Simplifying x + 7.875 = 8.148044244 Reorder the terms: 7.875 + x = 8.148044244 Solving 7.875 + x = 8.148044244 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7.875' to each side of the equation. 7.875 + -7.875 + x = 8.148044244 + -7.875 Combine like terms: 7.875 + -7.875 = 0.000 0.000 + x = 8.148044244 + -7.875 x = 8.148044244 + -7.875 Combine like terms: 8.148044244 + -7.875 = 0.273044244 x = 0.273044244 Simplifying x = 0.273044244

Subproblem 2

x + 7.875 = -8.148044244 Simplifying x + 7.875 = -8.148044244 Reorder the terms: 7.875 + x = -8.148044244 Solving 7.875 + x = -8.148044244 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7.875' to each side of the equation. 7.875 + -7.875 + x = -8.148044244 + -7.875 Combine like terms: 7.875 + -7.875 = 0.000 0.000 + x = -8.148044244 + -7.875 x = -8.148044244 + -7.875 Combine like terms: -8.148044244 + -7.875 = -16.023044244 x = -16.023044244 Simplifying x = -16.023044244

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.273044244, -16.023044244}

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