2x^2-20x=-49

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Solution for 2x^2-20x=-49 equation:


Simplifying
2x2 + -20x = -49

Reorder the terms:
-20x + 2x2 = -49

Solving
-20x + 2x2 = -49

Solving for variable 'x'.

Reorder the terms:
49 + -20x + 2x2 = -49 + 49

Combine like terms: -49 + 49 = 0
49 + -20x + 2x2 = 0

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

Divide each side by '2'.
24.5 + -10x + x2 = 0

Move the constant term to the right:

Add '-24.5' to each side of the equation.
24.5 + -10x + -24.5 + x2 = 0 + -24.5

Reorder the terms:
24.5 + -24.5 + -10x + x2 = 0 + -24.5

Combine like terms: 24.5 + -24.5 = 0.0
0.0 + -10x + x2 = 0 + -24.5
-10x + x2 = 0 + -24.5

Combine like terms: 0 + -24.5 = -24.5
-10x + x2 = -24.5

The x term is -10x.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10x + 25 + x2 = -24.5 + 25

Reorder the terms:
25 + -10x + x2 = -24.5 + 25

Combine like terms: -24.5 + 25 = 0.5
25 + -10x + x2 = 0.5

Factor a perfect square on the left side:
(x + -5)(x + -5) = 0.5

Calculate the square root of the right side: 0.707106781

Break this problem into two subproblems by setting 
(x + -5) equal to 0.707106781 and -0.707106781.

Subproblem 1

x + -5 = 0.707106781 Simplifying x + -5 = 0.707106781 Reorder the terms: -5 + x = 0.707106781 Solving -5 + x = 0.707106781 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = 0.707106781 + 5 Combine like terms: -5 + 5 = 0 0 + x = 0.707106781 + 5 x = 0.707106781 + 5 Combine like terms: 0.707106781 + 5 = 5.707106781 x = 5.707106781 Simplifying x = 5.707106781

Subproblem 2

x + -5 = -0.707106781 Simplifying x + -5 = -0.707106781 Reorder the terms: -5 + x = -0.707106781 Solving -5 + x = -0.707106781 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = -0.707106781 + 5 Combine like terms: -5 + 5 = 0 0 + x = -0.707106781 + 5 x = -0.707106781 + 5 Combine like terms: -0.707106781 + 5 = 4.292893219 x = 4.292893219 Simplifying x = 4.292893219

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.707106781, 4.292893219}

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