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 = 49.5
25 + -10x + x2 = 49.5

Factor a perfect square on the left side:
(x + -5)(x + -5) = 49.5

Calculate the square root of the right side: 7.03562364

Break this problem into two subproblems by setting 
(x + -5) equal to 7.03562364 and -7.03562364.

Subproblem 1

x + -5 = 7.03562364 Simplifying x + -5 = 7.03562364 Reorder the terms: -5 + x = 7.03562364 Solving -5 + x = 7.03562364 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 = 7.03562364 + 5 Combine like terms: -5 + 5 = 0 0 + x = 7.03562364 + 5 x = 7.03562364 + 5 Combine like terms: 7.03562364 + 5 = 12.03562364 x = 12.03562364 Simplifying x = 12.03562364

Subproblem 2

x + -5 = -7.03562364 Simplifying x + -5 = -7.03562364 Reorder the terms: -5 + x = -7.03562364 Solving -5 + x = -7.03562364 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 = -7.03562364 + 5 Combine like terms: -5 + 5 = 0 0 + x = -7.03562364 + 5 x = -7.03562364 + 5 Combine like terms: -7.03562364 + 5 = -2.03562364 x = -2.03562364 Simplifying x = -2.03562364

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.03562364, -2.03562364}

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