4x^2+11x+2=0

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Solution for 4x^2+11x+2=0 equation:


Simplifying
4x2 + 11x + 2 = 0

Reorder the terms:
2 + 11x + 4x2 = 0

Solving
2 + 11x + 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'.
0.5 + 2.75x + x2 = 0

Move the constant term to the right:

Add '-0.5' to each side of the equation.
0.5 + 2.75x + -0.5 + x2 = 0 + -0.5

Reorder the terms:
0.5 + -0.5 + 2.75x + x2 = 0 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + 2.75x + x2 = 0 + -0.5
2.75x + x2 = 0 + -0.5

Combine like terms: 0 + -0.5 = -0.5
2.75x + x2 = -0.5

The x term is 2.75x.  Take half its coefficient (1.375).
Square it (1.890625) and add it to both sides.

Add '1.890625' to each side of the equation.
2.75x + 1.890625 + x2 = -0.5 + 1.890625

Reorder the terms:
1.890625 + 2.75x + x2 = -0.5 + 1.890625

Combine like terms: -0.5 + 1.890625 = 1.390625
1.890625 + 2.75x + x2 = 1.390625

Factor a perfect square on the left side:
(x + 1.375)(x + 1.375) = 1.390625

Calculate the square root of the right side: 1.179247642

Break this problem into two subproblems by setting 
(x + 1.375) equal to 1.179247642 and -1.179247642.

Subproblem 1

x + 1.375 = 1.179247642 Simplifying x + 1.375 = 1.179247642 Reorder the terms: 1.375 + x = 1.179247642 Solving 1.375 + x = 1.179247642 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.375' to each side of the equation. 1.375 + -1.375 + x = 1.179247642 + -1.375 Combine like terms: 1.375 + -1.375 = 0.000 0.000 + x = 1.179247642 + -1.375 x = 1.179247642 + -1.375 Combine like terms: 1.179247642 + -1.375 = -0.195752358 x = -0.195752358 Simplifying x = -0.195752358

Subproblem 2

x + 1.375 = -1.179247642 Simplifying x + 1.375 = -1.179247642 Reorder the terms: 1.375 + x = -1.179247642 Solving 1.375 + x = -1.179247642 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.375' to each side of the equation. 1.375 + -1.375 + x = -1.179247642 + -1.375 Combine like terms: 1.375 + -1.375 = 0.000 0.000 + x = -1.179247642 + -1.375 x = -1.179247642 + -1.375 Combine like terms: -1.179247642 + -1.375 = -2.554247642 x = -2.554247642 Simplifying x = -2.554247642

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.195752358, -2.554247642}

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