2x^2+11x-4=0

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


Simplifying
2x2 + 11x + -4 = 0

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

Solving
-4 + 11x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
-2 + 5.5x + x2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + 5.5x + 2 + x2 = 0 + 2

Reorder the terms:
-2 + 2 + 5.5x + x2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + 5.5x + x2 = 0 + 2
5.5x + x2 = 0 + 2

Combine like terms: 0 + 2 = 2
5.5x + x2 = 2

The x term is 5.5x.  Take half its coefficient (2.75).
Square it (7.5625) and add it to both sides.

Add '7.5625' to each side of the equation.
5.5x + 7.5625 + x2 = 2 + 7.5625

Reorder the terms:
7.5625 + 5.5x + x2 = 2 + 7.5625

Combine like terms: 2 + 7.5625 = 9.5625
7.5625 + 5.5x + x2 = 9.5625

Factor a perfect square on the left side:
(x + 2.75)(x + 2.75) = 9.5625

Calculate the square root of the right side: 3.092329219

Break this problem into two subproblems by setting 
(x + 2.75) equal to 3.092329219 and -3.092329219.

Subproblem 1

x + 2.75 = 3.092329219 Simplifying x + 2.75 = 3.092329219 Reorder the terms: 2.75 + x = 3.092329219 Solving 2.75 + x = 3.092329219 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.75' to each side of the equation. 2.75 + -2.75 + x = 3.092329219 + -2.75 Combine like terms: 2.75 + -2.75 = 0.00 0.00 + x = 3.092329219 + -2.75 x = 3.092329219 + -2.75 Combine like terms: 3.092329219 + -2.75 = 0.342329219 x = 0.342329219 Simplifying x = 0.342329219

Subproblem 2

x + 2.75 = -3.092329219 Simplifying x + 2.75 = -3.092329219 Reorder the terms: 2.75 + x = -3.092329219 Solving 2.75 + x = -3.092329219 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.75' to each side of the equation. 2.75 + -2.75 + x = -3.092329219 + -2.75 Combine like terms: 2.75 + -2.75 = 0.00 0.00 + x = -3.092329219 + -2.75 x = -3.092329219 + -2.75 Combine like terms: -3.092329219 + -2.75 = -5.842329219 x = -5.842329219 Simplifying x = -5.842329219

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.342329219, -5.842329219}

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