2.5=10x-8x^2

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Solution for 2.5=10x-8x^2 equation:


Simplifying
2.5 = 10x + -8x2

Solving
2.5 = 10x + -8x2

Solving for variable 'x'.

Reorder the terms:
2.5 + -10x + 8x2 = 10x + -10x + -8x2 + 8x2

Combine like terms: 10x + -10x = 0
2.5 + -10x + 8x2 = 0 + -8x2 + 8x2
2.5 + -10x + 8x2 = -8x2 + 8x2

Combine like terms: -8x2 + 8x2 = 0
2.5 + -10x + 8x2 = 0

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

Divide each side by '8'.
0.3125 + -1.25x + x2 = 0

Move the constant term to the right:

Add '-0.3125' to each side of the equation.
0.3125 + -1.25x + -0.3125 + x2 = 0 + -0.3125

Reorder the terms:
0.3125 + -0.3125 + -1.25x + x2 = 0 + -0.3125

Combine like terms: 0.3125 + -0.3125 = 0.0000
0.0000 + -1.25x + x2 = 0 + -0.3125
-1.25x + x2 = 0 + -0.3125

Combine like terms: 0 + -0.3125 = -0.3125
-1.25x + x2 = -0.3125

The x term is -1.25x.  Take half its coefficient (-0.625).
Square it (0.390625) and add it to both sides.

Add '0.390625' to each side of the equation.
-1.25x + 0.390625 + x2 = -0.3125 + 0.390625

Reorder the terms:
0.390625 + -1.25x + x2 = -0.3125 + 0.390625

Combine like terms: -0.3125 + 0.390625 = 0.078125
0.390625 + -1.25x + x2 = 0.078125

Factor a perfect square on the left side:
(x + -0.625)(x + -0.625) = 0.078125

Calculate the square root of the right side: 0.279508497

Break this problem into two subproblems by setting 
(x + -0.625) equal to 0.279508497 and -0.279508497.

Subproblem 1

x + -0.625 = 0.279508497 Simplifying x + -0.625 = 0.279508497 Reorder the terms: -0.625 + x = 0.279508497 Solving -0.625 + x = 0.279508497 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + x = 0.279508497 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + x = 0.279508497 + 0.625 x = 0.279508497 + 0.625 Combine like terms: 0.279508497 + 0.625 = 0.904508497 x = 0.904508497 Simplifying x = 0.904508497

Subproblem 2

x + -0.625 = -0.279508497 Simplifying x + -0.625 = -0.279508497 Reorder the terms: -0.625 + x = -0.279508497 Solving -0.625 + x = -0.279508497 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + x = -0.279508497 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + x = -0.279508497 + 0.625 x = -0.279508497 + 0.625 Combine like terms: -0.279508497 + 0.625 = 0.345491503 x = 0.345491503 Simplifying x = 0.345491503

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.904508497, 0.345491503}

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