0=2x^2-16x-25

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Solution for 0=2x^2-16x-25 equation:


Simplifying
0 = 2x2 + -16x + -25

Reorder the terms:
0 = -25 + -16x + 2x2

Solving
0 = -25 + -16x + 2x2

Solving for variable 'x'.

Combine like terms: 0 + 25 = 25
25 + 16x + -2x2 = -25 + -16x + 2x2 + 25 + 16x + -2x2

Reorder the terms:
25 + 16x + -2x2 = -25 + 25 + -16x + 16x + 2x2 + -2x2

Combine like terms: -25 + 25 = 0
25 + 16x + -2x2 = 0 + -16x + 16x + 2x2 + -2x2
25 + 16x + -2x2 = -16x + 16x + 2x2 + -2x2

Combine like terms: -16x + 16x = 0
25 + 16x + -2x2 = 0 + 2x2 + -2x2
25 + 16x + -2x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
25 + 16x + -2x2 = 0

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

Divide each side by '-2'.
-12.5 + -8x + x2 = 0

Move the constant term to the right:

Add '12.5' to each side of the equation.
-12.5 + -8x + 12.5 + x2 = 0 + 12.5

Reorder the terms:
-12.5 + 12.5 + -8x + x2 = 0 + 12.5

Combine like terms: -12.5 + 12.5 = 0.0
0.0 + -8x + x2 = 0 + 12.5
-8x + x2 = 0 + 12.5

Combine like terms: 0 + 12.5 = 12.5
-8x + x2 = 12.5

The x term is -8x.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8x + 16 + x2 = 12.5 + 16

Reorder the terms:
16 + -8x + x2 = 12.5 + 16

Combine like terms: 12.5 + 16 = 28.5
16 + -8x + x2 = 28.5

Factor a perfect square on the left side:
(x + -4)(x + -4) = 28.5

Calculate the square root of the right side: 5.338539126

Break this problem into two subproblems by setting 
(x + -4) equal to 5.338539126 and -5.338539126.

Subproblem 1

x + -4 = 5.338539126 Simplifying x + -4 = 5.338539126 Reorder the terms: -4 + x = 5.338539126 Solving -4 + x = 5.338539126 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = 5.338539126 + 4 Combine like terms: -4 + 4 = 0 0 + x = 5.338539126 + 4 x = 5.338539126 + 4 Combine like terms: 5.338539126 + 4 = 9.338539126 x = 9.338539126 Simplifying x = 9.338539126

Subproblem 2

x + -4 = -5.338539126 Simplifying x + -4 = -5.338539126 Reorder the terms: -4 + x = -5.338539126 Solving -4 + x = -5.338539126 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = -5.338539126 + 4 Combine like terms: -4 + 4 = 0 0 + x = -5.338539126 + 4 x = -5.338539126 + 4 Combine like terms: -5.338539126 + 4 = -1.338539126 x = -1.338539126 Simplifying x = -1.338539126

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.338539126, -1.338539126}

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