2x^2+15x+30=24

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Solution for 2x^2+15x+30=24 equation:


Simplifying
2x2 + 15x + 30 = 24

Reorder the terms:
30 + 15x + 2x2 = 24

Solving
30 + 15x + 2x2 = 24

Solving for variable 'x'.

Reorder the terms:
30 + -24 + 15x + 2x2 = 24 + -24

Combine like terms: 30 + -24 = 6
6 + 15x + 2x2 = 24 + -24

Combine like terms: 24 + -24 = 0
6 + 15x + 2x2 = 0

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

Divide each side by '2'.
3 + 7.5x + x2 = 0

Move the constant term to the right:

Add '-3' to each side of the equation.
3 + 7.5x + -3 + x2 = 0 + -3

Reorder the terms:
3 + -3 + 7.5x + x2 = 0 + -3

Combine like terms: 3 + -3 = 0
0 + 7.5x + x2 = 0 + -3
7.5x + x2 = 0 + -3

Combine like terms: 0 + -3 = -3
7.5x + x2 = -3

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 = -3 + 14.0625

Reorder the terms:
14.0625 + 7.5x + x2 = -3 + 14.0625

Combine like terms: -3 + 14.0625 = 11.0625
14.0625 + 7.5x + x2 = 11.0625

Factor a perfect square on the left side:
(x + 3.75)(x + 3.75) = 11.0625

Calculate the square root of the right side: 3.326033674

Break this problem into two subproblems by setting 
(x + 3.75) equal to 3.326033674 and -3.326033674.

Subproblem 1

x + 3.75 = 3.326033674 Simplifying x + 3.75 = 3.326033674 Reorder the terms: 3.75 + x = 3.326033674 Solving 3.75 + x = 3.326033674 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 = 3.326033674 + -3.75 Combine like terms: 3.75 + -3.75 = 0.00 0.00 + x = 3.326033674 + -3.75 x = 3.326033674 + -3.75 Combine like terms: 3.326033674 + -3.75 = -0.423966326 x = -0.423966326 Simplifying x = -0.423966326

Subproblem 2

x + 3.75 = -3.326033674 Simplifying x + 3.75 = -3.326033674 Reorder the terms: 3.75 + x = -3.326033674 Solving 3.75 + x = -3.326033674 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 = -3.326033674 + -3.75 Combine like terms: 3.75 + -3.75 = 0.00 0.00 + x = -3.326033674 + -3.75 x = -3.326033674 + -3.75 Combine like terms: -3.326033674 + -3.75 = -7.076033674 x = -7.076033674 Simplifying x = -7.076033674

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.423966326, -7.076033674}

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