8x^2-24x-15=0

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Solution for 8x^2-24x-15=0 equation:


Simplifying
8x2 + -24x + -15 = 0

Reorder the terms:
-15 + -24x + 8x2 = 0

Solving
-15 + -24x + 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 + -3x + x2 = 0

Move the constant term to the right:

Add '1.875' to each side of the equation.
-1.875 + -3x + 1.875 + x2 = 0 + 1.875

Reorder the terms:
-1.875 + 1.875 + -3x + x2 = 0 + 1.875

Combine like terms: -1.875 + 1.875 = 0.000
0.000 + -3x + x2 = 0 + 1.875
-3x + x2 = 0 + 1.875

Combine like terms: 0 + 1.875 = 1.875
-3x + x2 = 1.875

The x term is -3x.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3x + 2.25 + x2 = 1.875 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 1.875 + 2.25

Combine like terms: 1.875 + 2.25 = 4.125
2.25 + -3x + x2 = 4.125

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 4.125

Calculate the square root of the right side: 2.031009601

Break this problem into two subproblems by setting 
(x + -1.5) equal to 2.031009601 and -2.031009601.

Subproblem 1

x + -1.5 = 2.031009601 Simplifying x + -1.5 = 2.031009601 Reorder the terms: -1.5 + x = 2.031009601 Solving -1.5 + x = 2.031009601 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = 2.031009601 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 2.031009601 + 1.5 x = 2.031009601 + 1.5 Combine like terms: 2.031009601 + 1.5 = 3.531009601 x = 3.531009601 Simplifying x = 3.531009601

Subproblem 2

x + -1.5 = -2.031009601 Simplifying x + -1.5 = -2.031009601 Reorder the terms: -1.5 + x = -2.031009601 Solving -1.5 + x = -2.031009601 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = -2.031009601 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -2.031009601 + 1.5 x = -2.031009601 + 1.5 Combine like terms: -2.031009601 + 1.5 = -0.531009601 x = -0.531009601 Simplifying x = -0.531009601

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.531009601, -0.531009601}

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