8x^2-16x=25

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Solution for 8x^2-16x=25 equation:


Simplifying
8x2 + -16x = 25

Reorder the terms:
-16x + 8x2 = 25

Solving
-16x + 8x2 = 25

Solving for variable 'x'.

Reorder the terms:
-25 + -16x + 8x2 = 25 + -25

Combine like terms: 25 + -25 = 0
-25 + -16x + 8x2 = 0

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

Divide each side by '8'.
-3.125 + -2x + x2 = 0

Move the constant term to the right:

Add '3.125' to each side of the equation.
-3.125 + -2x + 3.125 + x2 = 0 + 3.125

Reorder the terms:
-3.125 + 3.125 + -2x + x2 = 0 + 3.125

Combine like terms: -3.125 + 3.125 = 0.000
0.000 + -2x + x2 = 0 + 3.125
-2x + x2 = 0 + 3.125

Combine like terms: 0 + 3.125 = 3.125
-2x + x2 = 3.125

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 = 3.125 + 1

Reorder the terms:
1 + -2x + x2 = 3.125 + 1

Combine like terms: 3.125 + 1 = 4.125
1 + -2x + x2 = 4.125

Factor a perfect square on the left side:
(x + -1)(x + -1) = 4.125

Calculate the square root of the right side: 2.031009601

Break this problem into two subproblems by setting 
(x + -1) equal to 2.031009601 and -2.031009601.

Subproblem 1

x + -1 = 2.031009601 Simplifying x + -1 = 2.031009601 Reorder the terms: -1 + x = 2.031009601 Solving -1 + x = 2.031009601 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 = 2.031009601 + 1 Combine like terms: -1 + 1 = 0 0 + x = 2.031009601 + 1 x = 2.031009601 + 1 Combine like terms: 2.031009601 + 1 = 3.031009601 x = 3.031009601 Simplifying x = 3.031009601

Subproblem 2

x + -1 = -2.031009601 Simplifying x + -1 = -2.031009601 Reorder the terms: -1 + x = -2.031009601 Solving -1 + x = -2.031009601 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 = -2.031009601 + 1 Combine like terms: -1 + 1 = 0 0 + x = -2.031009601 + 1 x = -2.031009601 + 1 Combine like terms: -2.031009601 + 1 = -1.031009601 x = -1.031009601 Simplifying x = -1.031009601

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.031009601, -1.031009601}

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