2x^2+15x+24=0

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Solution for 2x^2+15x+24=0 equation:


Simplifying
2x2 + 15x + 24 = 0

Reorder the terms:
24 + 15x + 2x2 = 0

Solving
24 + 15x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
12 + 7.5x + x2 = 0

Move the constant term to the right:

Add '-12' to each side of the equation.
12 + 7.5x + -12 + x2 = 0 + -12

Reorder the terms:
12 + -12 + 7.5x + x2 = 0 + -12

Combine like terms: 12 + -12 = 0
0 + 7.5x + x2 = 0 + -12
7.5x + x2 = 0 + -12

Combine like terms: 0 + -12 = -12
7.5x + x2 = -12

The x term is 7.5x.  Take half its coefficient (3.75).
Square it (14.0625) and add it to both sides.

Add '14.0625' to each side of the equation.
7.5x + 14.0625 + x2 = -12 + 14.0625

Reorder the terms:
14.0625 + 7.5x + x2 = -12 + 14.0625

Combine like terms: -12 + 14.0625 = 2.0625
14.0625 + 7.5x + x2 = 2.0625

Factor a perfect square on the left side:
(x + 3.75)(x + 3.75) = 2.0625

Calculate the square root of the right side: 1.436140662

Break this problem into two subproblems by setting 
(x + 3.75) equal to 1.436140662 and -1.436140662.

Subproblem 1

x + 3.75 = 1.436140662 Simplifying x + 3.75 = 1.436140662 Reorder the terms: 3.75 + x = 1.436140662 Solving 3.75 + x = 1.436140662 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.75' to each side of the equation. 3.75 + -3.75 + x = 1.436140662 + -3.75 Combine like terms: 3.75 + -3.75 = 0.00 0.00 + x = 1.436140662 + -3.75 x = 1.436140662 + -3.75 Combine like terms: 1.436140662 + -3.75 = -2.313859338 x = -2.313859338 Simplifying x = -2.313859338

Subproblem 2

x + 3.75 = -1.436140662 Simplifying x + 3.75 = -1.436140662 Reorder the terms: 3.75 + x = -1.436140662 Solving 3.75 + x = -1.436140662 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.75' to each side of the equation. 3.75 + -3.75 + x = -1.436140662 + -3.75 Combine like terms: 3.75 + -3.75 = 0.00 0.00 + x = -1.436140662 + -3.75 x = -1.436140662 + -3.75 Combine like terms: -1.436140662 + -3.75 = -5.186140662 x = -5.186140662 Simplifying x = -5.186140662

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-2.313859338, -5.186140662}

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