0=x^2+11x-49

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Solution for 0=x^2+11x-49 equation:


Simplifying
0 = x2 + 11x + -49

Reorder the terms:
0 = -49 + 11x + x2

Solving
0 = -49 + 11x + x2

Solving for variable 'x'.

Combine like terms: 0 + 49 = 49
49 + -11x + -1x2 = -49 + 11x + x2 + 49 + -11x + -1x2

Reorder the terms:
49 + -11x + -1x2 = -49 + 49 + 11x + -11x + x2 + -1x2

Combine like terms: -49 + 49 = 0
49 + -11x + -1x2 = 0 + 11x + -11x + x2 + -1x2
49 + -11x + -1x2 = 11x + -11x + x2 + -1x2

Combine like terms: 11x + -11x = 0
49 + -11x + -1x2 = 0 + x2 + -1x2
49 + -11x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
49 + -11x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-49 + 11x + x2 = 0

Move the constant term to the right:

Add '49' to each side of the equation.
-49 + 11x + 49 + x2 = 0 + 49

Reorder the terms:
-49 + 49 + 11x + x2 = 0 + 49

Combine like terms: -49 + 49 = 0
0 + 11x + x2 = 0 + 49
11x + x2 = 0 + 49

Combine like terms: 0 + 49 = 49
11x + x2 = 49

The x term is 11x.  Take half its coefficient (5.5).
Square it (30.25) and add it to both sides.

Add '30.25' to each side of the equation.
11x + 30.25 + x2 = 49 + 30.25

Reorder the terms:
30.25 + 11x + x2 = 49 + 30.25

Combine like terms: 49 + 30.25 = 79.25
30.25 + 11x + x2 = 79.25

Factor a perfect square on the left side:
(x + 5.5)(x + 5.5) = 79.25

Calculate the square root of the right side: 8.902246907

Break this problem into two subproblems by setting 
(x + 5.5) equal to 8.902246907 and -8.902246907.

Subproblem 1

x + 5.5 = 8.902246907 Simplifying x + 5.5 = 8.902246907 Reorder the terms: 5.5 + x = 8.902246907 Solving 5.5 + x = 8.902246907 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.5' to each side of the equation. 5.5 + -5.5 + x = 8.902246907 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + x = 8.902246907 + -5.5 x = 8.902246907 + -5.5 Combine like terms: 8.902246907 + -5.5 = 3.402246907 x = 3.402246907 Simplifying x = 3.402246907

Subproblem 2

x + 5.5 = -8.902246907 Simplifying x + 5.5 = -8.902246907 Reorder the terms: 5.5 + x = -8.902246907 Solving 5.5 + x = -8.902246907 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.5' to each side of the equation. 5.5 + -5.5 + x = -8.902246907 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + x = -8.902246907 + -5.5 x = -8.902246907 + -5.5 Combine like terms: -8.902246907 + -5.5 = -14.402246907 x = -14.402246907 Simplifying x = -14.402246907

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.402246907, -14.402246907}

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