8x^2+24x=-15

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


Simplifying
8x2 + 24x = -15

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

Solving
24x + 8x2 = -15

Solving for variable 'x'.

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

Combine like terms: -15 + 15 = 0
15 + 24x + 8x2 = 0

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 = 0.375
2.25 + 3x + x2 = 0.375

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 0.375

Calculate the square root of the right side: 0.612372436

Break this problem into two subproblems by setting 
(x + 1.5) equal to 0.612372436 and -0.612372436.

Subproblem 1

x + 1.5 = 0.612372436 Simplifying x + 1.5 = 0.612372436 Reorder the terms: 1.5 + x = 0.612372436 Solving 1.5 + x = 0.612372436 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 = 0.612372436 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 0.612372436 + -1.5 x = 0.612372436 + -1.5 Combine like terms: 0.612372436 + -1.5 = -0.887627564 x = -0.887627564 Simplifying x = -0.887627564

Subproblem 2

x + 1.5 = -0.612372436 Simplifying x + 1.5 = -0.612372436 Reorder the terms: 1.5 + x = -0.612372436 Solving 1.5 + x = -0.612372436 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 = -0.612372436 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -0.612372436 + -1.5 x = -0.612372436 + -1.5 Combine like terms: -0.612372436 + -1.5 = -2.112372436 x = -2.112372436 Simplifying x = -2.112372436

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.887627564, -2.112372436}

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