x+8*x*x=2.5

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Solution for x+8*x*x=2.5 equation:


Simplifying
x + 8x * x = 2.5

Multiply x * x
x + 8x2 = 2.5

Solving
x + 8x2 = 2.5

Solving for variable 'x'.

Reorder the terms:
-2.5 + x + 8x2 = 2.5 + -2.5

Combine like terms: 2.5 + -2.5 = 0.0
-2.5 + x + 8x2 = 0.0

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

Divide each side by '8'.
-0.3125 + 0.125x + x2 = 0.0

Move the constant term to the right:

Add '0.3125' to each side of the equation.
-0.3125 + 0.125x + 0.3125 + x2 = 0.0 + 0.3125

Reorder the terms:
-0.3125 + 0.3125 + 0.125x + x2 = 0.0 + 0.3125

Combine like terms: -0.3125 + 0.3125 = 0.0000
0.0000 + 0.125x + x2 = 0.0 + 0.3125
0.125x + x2 = 0.0 + 0.3125

Combine like terms: 0.0 + 0.3125 = 0.3125
0.125x + x2 = 0.3125

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
0.125x + 0.25 + x2 = 0.3125 + 0.25

Reorder the terms:
0.25 + 0.125x + x2 = 0.3125 + 0.25

Combine like terms: 0.3125 + 0.25 = 0.5625
0.25 + 0.125x + x2 = 0.5625

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 0.5625

Calculate the square root of the right side: 0.75

Break this problem into two subproblems by setting 
(x + 0.5) equal to 0.75 and -0.75.

Subproblem 1

x + 0.5 = 0.75 Simplifying x + 0.5 = 0.75 Reorder the terms: 0.5 + x = 0.75 Solving 0.5 + x = 0.75 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 0.75 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 0.75 + -0.5 x = 0.75 + -0.5 Combine like terms: 0.75 + -0.5 = 0.25 x = 0.25 Simplifying x = 0.25

Subproblem 2

x + 0.5 = -0.75 Simplifying x + 0.5 = -0.75 Reorder the terms: 0.5 + x = -0.75 Solving 0.5 + x = -0.75 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -0.75 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -0.75 + -0.5 x = -0.75 + -0.5 Combine like terms: -0.75 + -0.5 = -1.25 x = -1.25 Simplifying x = -1.25

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.25, -1.25}

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