8x^2-46x-15=0

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Solution for 8x^2-46x-15=0 equation:


Simplifying
8x2 + -46x + -15 = 0

Reorder the terms:
-15 + -46x + 8x2 = 0

Solving
-15 + -46x + 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 + -5.75x + x2 = 0

Move the constant term to the right:

Add '1.875' to each side of the equation.
-1.875 + -5.75x + 1.875 + x2 = 0 + 1.875

Reorder the terms:
-1.875 + 1.875 + -5.75x + x2 = 0 + 1.875

Combine like terms: -1.875 + 1.875 = 0.000
0.000 + -5.75x + x2 = 0 + 1.875
-5.75x + x2 = 0 + 1.875

Combine like terms: 0 + 1.875 = 1.875
-5.75x + x2 = 1.875

The x term is -5.75x.  Take half its coefficient (-2.875).
Square it (8.265625) and add it to both sides.

Add '8.265625' to each side of the equation.
-5.75x + 8.265625 + x2 = 1.875 + 8.265625

Reorder the terms:
8.265625 + -5.75x + x2 = 1.875 + 8.265625

Combine like terms: 1.875 + 8.265625 = 10.140625
8.265625 + -5.75x + x2 = 10.140625

Factor a perfect square on the left side:
(x + -2.875)(x + -2.875) = 10.140625

Calculate the square root of the right side: 3.184434801

Break this problem into two subproblems by setting 
(x + -2.875) equal to 3.184434801 and -3.184434801.

Subproblem 1

x + -2.875 = 3.184434801 Simplifying x + -2.875 = 3.184434801 Reorder the terms: -2.875 + x = 3.184434801 Solving -2.875 + x = 3.184434801 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.875' to each side of the equation. -2.875 + 2.875 + x = 3.184434801 + 2.875 Combine like terms: -2.875 + 2.875 = 0.000 0.000 + x = 3.184434801 + 2.875 x = 3.184434801 + 2.875 Combine like terms: 3.184434801 + 2.875 = 6.059434801 x = 6.059434801 Simplifying x = 6.059434801

Subproblem 2

x + -2.875 = -3.184434801 Simplifying x + -2.875 = -3.184434801 Reorder the terms: -2.875 + x = -3.184434801 Solving -2.875 + x = -3.184434801 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.875' to each side of the equation. -2.875 + 2.875 + x = -3.184434801 + 2.875 Combine like terms: -2.875 + 2.875 = 0.000 0.000 + x = -3.184434801 + 2.875 x = -3.184434801 + 2.875 Combine like terms: -3.184434801 + 2.875 = -0.309434801 x = -0.309434801 Simplifying x = -0.309434801

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.059434801, -0.309434801}

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