5x^2+30x+36=0

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Solution for 5x^2+30x+36=0 equation:


Simplifying
5x2 + 30x + 36 = 0

Reorder the terms:
36 + 30x + 5x2 = 0

Solving
36 + 30x + 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'.
7.2 + 6x + x2 = 0

Move the constant term to the right:

Add '-7.2' to each side of the equation.
7.2 + 6x + -7.2 + x2 = 0 + -7.2

Reorder the terms:
7.2 + -7.2 + 6x + x2 = 0 + -7.2

Combine like terms: 7.2 + -7.2 = 0.0
0.0 + 6x + x2 = 0 + -7.2
6x + x2 = 0 + -7.2

Combine like terms: 0 + -7.2 = -7.2
6x + x2 = -7.2

The x term is 6x.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6x + 9 + x2 = -7.2 + 9

Reorder the terms:
9 + 6x + x2 = -7.2 + 9

Combine like terms: -7.2 + 9 = 1.8
9 + 6x + x2 = 1.8

Factor a perfect square on the left side:
(x + 3)(x + 3) = 1.8

Calculate the square root of the right side: 1.341640787

Break this problem into two subproblems by setting 
(x + 3) equal to 1.341640787 and -1.341640787.

Subproblem 1

x + 3 = 1.341640787 Simplifying x + 3 = 1.341640787 Reorder the terms: 3 + x = 1.341640787 Solving 3 + x = 1.341640787 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = 1.341640787 + -3 Combine like terms: 3 + -3 = 0 0 + x = 1.341640787 + -3 x = 1.341640787 + -3 Combine like terms: 1.341640787 + -3 = -1.658359213 x = -1.658359213 Simplifying x = -1.658359213

Subproblem 2

x + 3 = -1.341640787 Simplifying x + 3 = -1.341640787 Reorder the terms: 3 + x = -1.341640787 Solving 3 + x = -1.341640787 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = -1.341640787 + -3 Combine like terms: 3 + -3 = 0 0 + x = -1.341640787 + -3 x = -1.341640787 + -3 Combine like terms: -1.341640787 + -3 = -4.341640787 x = -4.341640787 Simplifying x = -4.341640787

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-1.658359213, -4.341640787}

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