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 = 2.390625
1.890625 + 2.75x + x2 = 2.390625

Factor a perfect square on the left side:
(x + 1.375)(x + 1.375) = 2.390625

Calculate the square root of the right side: 1.54616461

Break this problem into two subproblems by setting 
(x + 1.375) equal to 1.54616461 and -1.54616461.

Subproblem 1

x + 1.375 = 1.54616461 Simplifying x + 1.375 = 1.54616461 Reorder the terms: 1.375 + x = 1.54616461 Solving 1.375 + x = 1.54616461 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 = 1.54616461 + -1.375 Combine like terms: 1.375 + -1.375 = 0.000 0.000 + x = 1.54616461 + -1.375 x = 1.54616461 + -1.375 Combine like terms: 1.54616461 + -1.375 = 0.17116461 x = 0.17116461 Simplifying x = 0.17116461

Subproblem 2

x + 1.375 = -1.54616461 Simplifying x + 1.375 = -1.54616461 Reorder the terms: 1.375 + x = -1.54616461 Solving 1.375 + x = -1.54616461 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 = -1.54616461 + -1.375 Combine like terms: 1.375 + -1.375 = 0.000 0.000 + x = -1.54616461 + -1.375 x = -1.54616461 + -1.375 Combine like terms: -1.54616461 + -1.375 = -2.92116461 x = -2.92116461 Simplifying x = -2.92116461

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.17116461, -2.92116461}

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