5x^2+10x-11=0

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Solution for 5x^2+10x-11=0 equation:


Simplifying
5x2 + 10x + -11 = 0

Reorder the terms:
-11 + 10x + 5x2 = 0

Solving
-11 + 10x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
-2.2 + 2x + x2 = 0

Move the constant term to the right:

Add '2.2' to each side of the equation.
-2.2 + 2x + 2.2 + x2 = 0 + 2.2

Reorder the terms:
-2.2 + 2.2 + 2x + x2 = 0 + 2.2

Combine like terms: -2.2 + 2.2 = 0.0
0.0 + 2x + x2 = 0 + 2.2
2x + x2 = 0 + 2.2

Combine like terms: 0 + 2.2 = 2.2
2x + x2 = 2.2

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 2.2 + 1

Reorder the terms:
1 + 2x + x2 = 2.2 + 1

Combine like terms: 2.2 + 1 = 3.2
1 + 2x + x2 = 3.2

Factor a perfect square on the left side:
(x + 1)(x + 1) = 3.2

Calculate the square root of the right side: 1.788854382

Break this problem into two subproblems by setting 
(x + 1) equal to 1.788854382 and -1.788854382.

Subproblem 1

x + 1 = 1.788854382 Simplifying x + 1 = 1.788854382 Reorder the terms: 1 + x = 1.788854382 Solving 1 + x = 1.788854382 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 1.788854382 + -1 Combine like terms: 1 + -1 = 0 0 + x = 1.788854382 + -1 x = 1.788854382 + -1 Combine like terms: 1.788854382 + -1 = 0.788854382 x = 0.788854382 Simplifying x = 0.788854382

Subproblem 2

x + 1 = -1.788854382 Simplifying x + 1 = -1.788854382 Reorder the terms: 1 + x = -1.788854382 Solving 1 + x = -1.788854382 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -1.788854382 + -1 Combine like terms: 1 + -1 = 0 0 + x = -1.788854382 + -1 x = -1.788854382 + -1 Combine like terms: -1.788854382 + -1 = -2.788854382 x = -2.788854382 Simplifying x = -2.788854382

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.788854382, -2.788854382}

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