5x^2+24x+15=0

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Solution for 5x^2+24x+15=0 equation:


Simplifying
5x2 + 24x + 15 = 0

Reorder the terms:
15 + 24x + 5x2 = 0

Solving
15 + 24x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
3 + 4.8x + x2 = 0

Move the constant term to the right:

Add '-3' to each side of the equation.
3 + 4.8x + -3 + x2 = 0 + -3

Reorder the terms:
3 + -3 + 4.8x + x2 = 0 + -3

Combine like terms: 3 + -3 = 0
0 + 4.8x + x2 = 0 + -3
4.8x + x2 = 0 + -3

Combine like terms: 0 + -3 = -3
4.8x + x2 = -3

The x term is 4.8x.  Take half its coefficient (2.4).
Square it (5.76) and add it to both sides.

Add '5.76' to each side of the equation.
4.8x + 5.76 + x2 = -3 + 5.76

Reorder the terms:
5.76 + 4.8x + x2 = -3 + 5.76

Combine like terms: -3 + 5.76 = 2.76
5.76 + 4.8x + x2 = 2.76

Factor a perfect square on the left side:
(x + 2.4)(x + 2.4) = 2.76

Calculate the square root of the right side: 1.661324773

Break this problem into two subproblems by setting 
(x + 2.4) equal to 1.661324773 and -1.661324773.

Subproblem 1

x + 2.4 = 1.661324773 Simplifying x + 2.4 = 1.661324773 Reorder the terms: 2.4 + x = 1.661324773 Solving 2.4 + x = 1.661324773 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.4' to each side of the equation. 2.4 + -2.4 + x = 1.661324773 + -2.4 Combine like terms: 2.4 + -2.4 = 0.0 0.0 + x = 1.661324773 + -2.4 x = 1.661324773 + -2.4 Combine like terms: 1.661324773 + -2.4 = -0.738675227 x = -0.738675227 Simplifying x = -0.738675227

Subproblem 2

x + 2.4 = -1.661324773 Simplifying x + 2.4 = -1.661324773 Reorder the terms: 2.4 + x = -1.661324773 Solving 2.4 + x = -1.661324773 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.4' to each side of the equation. 2.4 + -2.4 + x = -1.661324773 + -2.4 Combine like terms: 2.4 + -2.4 = 0.0 0.0 + x = -1.661324773 + -2.4 x = -1.661324773 + -2.4 Combine like terms: -1.661324773 + -2.4 = -4.061324773 x = -4.061324773 Simplifying x = -4.061324773

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.738675227, -4.061324773}

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