10x-2x^2-2.5=0

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Solution for 10x-2x^2-2.5=0 equation:


Simplifying
10x + -2x2 + -2.5 = 0

Reorder the terms:
-2.5 + 10x + -2x2 = 0

Solving
-2.5 + 10x + -2x2 = 0

Solving for variable 'x'.

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

Divide each side by '-2'.
1.25 + -5x + x2 = 0

Move the constant term to the right:

Add '-1.25' to each side of the equation.
1.25 + -5x + -1.25 + x2 = 0 + -1.25

Reorder the terms:
1.25 + -1.25 + -5x + x2 = 0 + -1.25

Combine like terms: 1.25 + -1.25 = 0.00
0.00 + -5x + x2 = 0 + -1.25
-5x + x2 = 0 + -1.25

Combine like terms: 0 + -1.25 = -1.25
-5x + x2 = -1.25

The x term is -5x.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5x + 6.25 + x2 = -1.25 + 6.25

Reorder the terms:
6.25 + -5x + x2 = -1.25 + 6.25

Combine like terms: -1.25 + 6.25 = 5
6.25 + -5x + x2 = 5

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 5

Calculate the square root of the right side: 2.236067978

Break this problem into two subproblems by setting 
(x + -2.5) equal to 2.236067978 and -2.236067978.

Subproblem 1

x + -2.5 = 2.236067978 Simplifying x + -2.5 = 2.236067978 Reorder the terms: -2.5 + x = 2.236067978 Solving -2.5 + x = 2.236067978 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = 2.236067978 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = 2.236067978 + 2.5 x = 2.236067978 + 2.5 Combine like terms: 2.236067978 + 2.5 = 4.736067978 x = 4.736067978 Simplifying x = 4.736067978

Subproblem 2

x + -2.5 = -2.236067978 Simplifying x + -2.5 = -2.236067978 Reorder the terms: -2.5 + x = -2.236067978 Solving -2.5 + x = -2.236067978 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = -2.236067978 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = -2.236067978 + 2.5 x = -2.236067978 + 2.5 Combine like terms: -2.236067978 + 2.5 = 0.263932022 x = 0.263932022 Simplifying x = 0.263932022

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.736067978, 0.263932022}

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