9x^2+36x+16=0

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Solution for 9x^2+36x+16=0 equation:


Simplifying
9x2 + 36x + 16 = 0

Reorder the terms:
16 + 36x + 9x2 = 0

Solving
16 + 36x + 9x2 = 0

Solving for variable 'x'.

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

Divide each side by '9'.
1.777777778 + 4x + x2 = 0

Move the constant term to the right:

Add '-1.777777778' to each side of the equation.
1.777777778 + 4x + -1.777777778 + x2 = 0 + -1.777777778

Reorder the terms:
1.777777778 + -1.777777778 + 4x + x2 = 0 + -1.777777778

Combine like terms: 1.777777778 + -1.777777778 = 0.000000000
0.000000000 + 4x + x2 = 0 + -1.777777778
4x + x2 = 0 + -1.777777778

Combine like terms: 0 + -1.777777778 = -1.777777778
4x + x2 = -1.777777778

The x term is 4x.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x + 4 + x2 = -1.777777778 + 4

Reorder the terms:
4 + 4x + x2 = -1.777777778 + 4

Combine like terms: -1.777777778 + 4 = 2.222222222
4 + 4x + x2 = 2.222222222

Factor a perfect square on the left side:
(x + 2)(x + 2) = 2.222222222

Calculate the square root of the right side: 1.490711985

Break this problem into two subproblems by setting 
(x + 2) equal to 1.490711985 and -1.490711985.

Subproblem 1

x + 2 = 1.490711985 Simplifying x + 2 = 1.490711985 Reorder the terms: 2 + x = 1.490711985 Solving 2 + x = 1.490711985 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 1.490711985 + -2 Combine like terms: 2 + -2 = 0 0 + x = 1.490711985 + -2 x = 1.490711985 + -2 Combine like terms: 1.490711985 + -2 = -0.509288015 x = -0.509288015 Simplifying x = -0.509288015

Subproblem 2

x + 2 = -1.490711985 Simplifying x + 2 = -1.490711985 Reorder the terms: 2 + x = -1.490711985 Solving 2 + x = -1.490711985 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -1.490711985 + -2 Combine like terms: 2 + -2 = 0 0 + x = -1.490711985 + -2 x = -1.490711985 + -2 Combine like terms: -1.490711985 + -2 = -3.490711985 x = -3.490711985 Simplifying x = -3.490711985

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.509288015, -3.490711985}

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