2x^2-4x=19

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Solution for 2x^2-4x=19 equation:


Simplifying
2x2 + -4x = 19

Reorder the terms:
-4x + 2x2 = 19

Solving
-4x + 2x2 = 19

Solving for variable 'x'.

Reorder the terms:
-19 + -4x + 2x2 = 19 + -19

Combine like terms: 19 + -19 = 0
-19 + -4x + 2x2 = 0

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

Divide each side by '2'.
-9.5 + -2x + x2 = 0

Move the constant term to the right:

Add '9.5' to each side of the equation.
-9.5 + -2x + 9.5 + x2 = 0 + 9.5

Reorder the terms:
-9.5 + 9.5 + -2x + x2 = 0 + 9.5

Combine like terms: -9.5 + 9.5 = 0.0
0.0 + -2x + x2 = 0 + 9.5
-2x + x2 = 0 + 9.5

Combine like terms: 0 + 9.5 = 9.5
-2x + x2 = 9.5

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 = 9.5 + 1

Reorder the terms:
1 + -2x + x2 = 9.5 + 1

Combine like terms: 9.5 + 1 = 10.5
1 + -2x + x2 = 10.5

Factor a perfect square on the left side:
(x + -1)(x + -1) = 10.5

Calculate the square root of the right side: 3.240370349

Break this problem into two subproblems by setting 
(x + -1) equal to 3.240370349 and -3.240370349.

Subproblem 1

x + -1 = 3.240370349 Simplifying x + -1 = 3.240370349 Reorder the terms: -1 + x = 3.240370349 Solving -1 + x = 3.240370349 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 = 3.240370349 + 1 Combine like terms: -1 + 1 = 0 0 + x = 3.240370349 + 1 x = 3.240370349 + 1 Combine like terms: 3.240370349 + 1 = 4.240370349 x = 4.240370349 Simplifying x = 4.240370349

Subproblem 2

x + -1 = -3.240370349 Simplifying x + -1 = -3.240370349 Reorder the terms: -1 + x = -3.240370349 Solving -1 + x = -3.240370349 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 = -3.240370349 + 1 Combine like terms: -1 + 1 = 0 0 + x = -3.240370349 + 1 x = -3.240370349 + 1 Combine like terms: -3.240370349 + 1 = -2.240370349 x = -2.240370349 Simplifying x = -2.240370349

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.240370349, -2.240370349}

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