5x^2+35x+36=0

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Solution for 5x^2+35x+36=0 equation:


Simplifying
5x2 + 35x + 36 = 0

Reorder the terms:
36 + 35x + 5x2 = 0

Solving
36 + 35x + 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 + 7x + x2 = 0

Move the constant term to the right:

Add '-7.2' to each side of the equation.
7.2 + 7x + -7.2 + x2 = 0 + -7.2

Reorder the terms:
7.2 + -7.2 + 7x + x2 = 0 + -7.2

Combine like terms: 7.2 + -7.2 = 0.0
0.0 + 7x + x2 = 0 + -7.2
7x + x2 = 0 + -7.2

Combine like terms: 0 + -7.2 = -7.2
7x + x2 = -7.2

The x term is 7x.  Take half its coefficient (3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
7x + 12.25 + x2 = -7.2 + 12.25

Reorder the terms:
12.25 + 7x + x2 = -7.2 + 12.25

Combine like terms: -7.2 + 12.25 = 5.05
12.25 + 7x + x2 = 5.05

Factor a perfect square on the left side:
(x + 3.5)(x + 3.5) = 5.05

Calculate the square root of the right side: 2.247220505

Break this problem into two subproblems by setting 
(x + 3.5) equal to 2.247220505 and -2.247220505.

Subproblem 1

x + 3.5 = 2.247220505 Simplifying x + 3.5 = 2.247220505 Reorder the terms: 3.5 + x = 2.247220505 Solving 3.5 + x = 2.247220505 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = 2.247220505 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = 2.247220505 + -3.5 x = 2.247220505 + -3.5 Combine like terms: 2.247220505 + -3.5 = -1.252779495 x = -1.252779495 Simplifying x = -1.252779495

Subproblem 2

x + 3.5 = -2.247220505 Simplifying x + 3.5 = -2.247220505 Reorder the terms: 3.5 + x = -2.247220505 Solving 3.5 + x = -2.247220505 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = -2.247220505 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = -2.247220505 + -3.5 x = -2.247220505 + -3.5 Combine like terms: -2.247220505 + -3.5 = -5.747220505 x = -5.747220505 Simplifying x = -5.747220505

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-1.252779495, -5.747220505}

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