8x^2-29x-15=0

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Solution for 8x^2-29x-15=0 equation:


Simplifying
8x2 + -29x + -15 = 0

Reorder the terms:
-15 + -29x + 8x2 = 0

Solving
-15 + -29x + 8x2 = 0

Solving for variable 'x'.

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

Divide each side by '8'.
-1.875 + -3.625x + x2 = 0

Move the constant term to the right:

Add '1.875' to each side of the equation.
-1.875 + -3.625x + 1.875 + x2 = 0 + 1.875

Reorder the terms:
-1.875 + 1.875 + -3.625x + x2 = 0 + 1.875

Combine like terms: -1.875 + 1.875 = 0.000
0.000 + -3.625x + x2 = 0 + 1.875
-3.625x + x2 = 0 + 1.875

Combine like terms: 0 + 1.875 = 1.875
-3.625x + x2 = 1.875

The x term is -3.625x.  Take half its coefficient (-1.8125).
Square it (3.28515625) and add it to both sides.

Add '3.28515625' to each side of the equation.
-3.625x + 3.28515625 + x2 = 1.875 + 3.28515625

Reorder the terms:
3.28515625 + -3.625x + x2 = 1.875 + 3.28515625

Combine like terms: 1.875 + 3.28515625 = 5.16015625
3.28515625 + -3.625x + x2 = 5.16015625

Factor a perfect square on the left side:
(x + -1.8125)(x + -1.8125) = 5.16015625

Calculate the square root of the right side: 2.271597731

Break this problem into two subproblems by setting 
(x + -1.8125) equal to 2.271597731 and -2.271597731.

Subproblem 1

x + -1.8125 = 2.271597731 Simplifying x + -1.8125 = 2.271597731 Reorder the terms: -1.8125 + x = 2.271597731 Solving -1.8125 + x = 2.271597731 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.8125' to each side of the equation. -1.8125 + 1.8125 + x = 2.271597731 + 1.8125 Combine like terms: -1.8125 + 1.8125 = 0.0000 0.0000 + x = 2.271597731 + 1.8125 x = 2.271597731 + 1.8125 Combine like terms: 2.271597731 + 1.8125 = 4.084097731 x = 4.084097731 Simplifying x = 4.084097731

Subproblem 2

x + -1.8125 = -2.271597731 Simplifying x + -1.8125 = -2.271597731 Reorder the terms: -1.8125 + x = -2.271597731 Solving -1.8125 + x = -2.271597731 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.8125' to each side of the equation. -1.8125 + 1.8125 + x = -2.271597731 + 1.8125 Combine like terms: -1.8125 + 1.8125 = 0.0000 0.0000 + x = -2.271597731 + 1.8125 x = -2.271597731 + 1.8125 Combine like terms: -2.271597731 + 1.8125 = -0.459097731 x = -0.459097731 Simplifying x = -0.459097731

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.084097731, -0.459097731}

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