2x^2-8x-25=0

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Solution for 2x^2-8x-25=0 equation:


Simplifying
2x2 + -8x + -25 = 0

Reorder the terms:
-25 + -8x + 2x2 = 0

Solving
-25 + -8x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
-12.5 + -4x + x2 = 0

Move the constant term to the right:

Add '12.5' to each side of the equation.
-12.5 + -4x + 12.5 + x2 = 0 + 12.5

Reorder the terms:
-12.5 + 12.5 + -4x + x2 = 0 + 12.5

Combine like terms: -12.5 + 12.5 = 0.0
0.0 + -4x + x2 = 0 + 12.5
-4x + x2 = 0 + 12.5

Combine like terms: 0 + 12.5 = 12.5
-4x + x2 = 12.5

The x term is -4x.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4x + 4 + x2 = 12.5 + 4

Reorder the terms:
4 + -4x + x2 = 12.5 + 4

Combine like terms: 12.5 + 4 = 16.5
4 + -4x + x2 = 16.5

Factor a perfect square on the left side:
(x + -2)(x + -2) = 16.5

Calculate the square root of the right side: 4.062019202

Break this problem into two subproblems by setting 
(x + -2) equal to 4.062019202 and -4.062019202.

Subproblem 1

x + -2 = 4.062019202 Simplifying x + -2 = 4.062019202 Reorder the terms: -2 + x = 4.062019202 Solving -2 + x = 4.062019202 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = 4.062019202 + 2 Combine like terms: -2 + 2 = 0 0 + x = 4.062019202 + 2 x = 4.062019202 + 2 Combine like terms: 4.062019202 + 2 = 6.062019202 x = 6.062019202 Simplifying x = 6.062019202

Subproblem 2

x + -2 = -4.062019202 Simplifying x + -2 = -4.062019202 Reorder the terms: -2 + x = -4.062019202 Solving -2 + x = -4.062019202 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = -4.062019202 + 2 Combine like terms: -2 + 2 = 0 0 + x = -4.062019202 + 2 x = -4.062019202 + 2 Combine like terms: -4.062019202 + 2 = -2.062019202 x = -2.062019202 Simplifying x = -2.062019202

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.062019202, -2.062019202}

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