4x^2+16x+3=0

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Solution for 4x^2+16x+3=0 equation:


Simplifying
4x2 + 16x + 3 = 0

Reorder the terms:
3 + 16x + 4x2 = 0

Solving
3 + 16x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
0.75 + 4x + x2 = 0

Move the constant term to the right:

Add '-0.75' to each side of the equation.
0.75 + 4x + -0.75 + x2 = 0 + -0.75

Reorder the terms:
0.75 + -0.75 + 4x + x2 = 0 + -0.75

Combine like terms: 0.75 + -0.75 = 0.00
0.00 + 4x + x2 = 0 + -0.75
4x + x2 = 0 + -0.75

Combine like terms: 0 + -0.75 = -0.75
4x + x2 = -0.75

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 = -0.75 + 4

Reorder the terms:
4 + 4x + x2 = -0.75 + 4

Combine like terms: -0.75 + 4 = 3.25
4 + 4x + x2 = 3.25

Factor a perfect square on the left side:
(x + 2)(x + 2) = 3.25

Calculate the square root of the right side: 1.802775638

Break this problem into two subproblems by setting 
(x + 2) equal to 1.802775638 and -1.802775638.

Subproblem 1

x + 2 = 1.802775638 Simplifying x + 2 = 1.802775638 Reorder the terms: 2 + x = 1.802775638 Solving 2 + x = 1.802775638 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 = 1.802775638 + -2 Combine like terms: 2 + -2 = 0 0 + x = 1.802775638 + -2 x = 1.802775638 + -2 Combine like terms: 1.802775638 + -2 = -0.197224362 x = -0.197224362 Simplifying x = -0.197224362

Subproblem 2

x + 2 = -1.802775638 Simplifying x + 2 = -1.802775638 Reorder the terms: 2 + x = -1.802775638 Solving 2 + x = -1.802775638 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 = -1.802775638 + -2 Combine like terms: 2 + -2 = 0 0 + x = -1.802775638 + -2 x = -1.802775638 + -2 Combine like terms: -1.802775638 + -2 = -3.802775638 x = -3.802775638 Simplifying x = -3.802775638

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.197224362, -3.802775638}

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