8x^2+2x=25+x

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Solution for 8x^2+2x=25+x equation:


Simplifying
8x2 + 2x = 25 + x

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

Solving
2x + 8x2 = 25 + x

Solving for variable 'x'.

Reorder the terms:
-25 + 2x + -1x + 8x2 = 25 + x + -25 + -1x

Combine like terms: 2x + -1x = 1x
-25 + 1x + 8x2 = 25 + x + -25 + -1x

Reorder the terms:
-25 + 1x + 8x2 = 25 + -25 + x + -1x

Combine like terms: 25 + -25 = 0
-25 + 1x + 8x2 = 0 + x + -1x
-25 + 1x + 8x2 = x + -1x

Combine like terms: x + -1x = 0
-25 + 1x + 8x2 = 0

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

Divide each side by '8'.
-3.125 + 0.125x + x2 = 0

Move the constant term to the right:

Add '3.125' to each side of the equation.
-3.125 + 0.125x + 3.125 + x2 = 0 + 3.125

Reorder the terms:
-3.125 + 3.125 + 0.125x + x2 = 0 + 3.125

Combine like terms: -3.125 + 3.125 = 0.000
0.000 + 0.125x + x2 = 0 + 3.125
0.125x + x2 = 0 + 3.125

Combine like terms: 0 + 3.125 = 3.125
0.125x + x2 = 3.125

The x term is 0.125x.  Take half its coefficient (0.0625).
Square it (0.00390625) and add it to both sides.

Add '0.00390625' to each side of the equation.
0.125x + 0.00390625 + x2 = 3.125 + 0.00390625

Reorder the terms:
0.00390625 + 0.125x + x2 = 3.125 + 0.00390625

Combine like terms: 3.125 + 0.00390625 = 3.12890625
0.00390625 + 0.125x + x2 = 3.12890625

Factor a perfect square on the left side:
(x + 0.0625)(x + 0.0625) = 3.12890625

Calculate the square root of the right side: 1.768871462

Break this problem into two subproblems by setting 
(x + 0.0625) equal to 1.768871462 and -1.768871462.

Subproblem 1

x + 0.0625 = 1.768871462 Simplifying x + 0.0625 = 1.768871462 Reorder the terms: 0.0625 + x = 1.768871462 Solving 0.0625 + x = 1.768871462 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.0625' to each side of the equation. 0.0625 + -0.0625 + x = 1.768871462 + -0.0625 Combine like terms: 0.0625 + -0.0625 = 0.0000 0.0000 + x = 1.768871462 + -0.0625 x = 1.768871462 + -0.0625 Combine like terms: 1.768871462 + -0.0625 = 1.706371462 x = 1.706371462 Simplifying x = 1.706371462

Subproblem 2

x + 0.0625 = -1.768871462 Simplifying x + 0.0625 = -1.768871462 Reorder the terms: 0.0625 + x = -1.768871462 Solving 0.0625 + x = -1.768871462 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.0625' to each side of the equation. 0.0625 + -0.0625 + x = -1.768871462 + -0.0625 Combine like terms: 0.0625 + -0.0625 = 0.0000 0.0000 + x = -1.768871462 + -0.0625 x = -1.768871462 + -0.0625 Combine like terms: -1.768871462 + -0.0625 = -1.831371462 x = -1.831371462 Simplifying x = -1.831371462

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.706371462, -1.831371462}

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