0.25x^2=4-x

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Solution for 0.25x^2=4-x equation:


Simplifying
0.25x2 = 4 + -1x

Solving
0.25x2 = 4 + -1x

Solving for variable 'x'.

Reorder the terms:
-4 + x + 0.25x2 = 4 + -1x + -4 + x

Reorder the terms:
-4 + x + 0.25x2 = 4 + -4 + -1x + x

Combine like terms: 4 + -4 = 0
-4 + x + 0.25x2 = 0 + -1x + x
-4 + x + 0.25x2 = -1x + x

Combine like terms: -1x + x = 0
-4 + x + 0.25x2 = 0

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

Divide each side by '0.25'.
-16 + 4x + x2 = 0

Move the constant term to the right:

Add '16' to each side of the equation.
-16 + 4x + 16 + x2 = 0 + 16

Reorder the terms:
-16 + 16 + 4x + x2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + 4x + x2 = 0 + 16
4x + x2 = 0 + 16

Combine like terms: 0 + 16 = 16
4x + x2 = 16

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.
4x + 0.25 + x2 = 16 + 0.25

Reorder the terms:
0.25 + 4x + x2 = 16 + 0.25

Combine like terms: 16 + 0.25 = 16.25
0.25 + 4x + x2 = 16.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 16.25

Calculate the square root of the right side: 4.031128874

Break this problem into two subproblems by setting 
(x + 0.5) equal to 4.031128874 and -4.031128874.

Subproblem 1

x + 0.5 = 4.031128874 Simplifying x + 0.5 = 4.031128874 Reorder the terms: 0.5 + x = 4.031128874 Solving 0.5 + x = 4.031128874 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 = 4.031128874 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 4.031128874 + -0.5 x = 4.031128874 + -0.5 Combine like terms: 4.031128874 + -0.5 = 3.531128874 x = 3.531128874 Simplifying x = 3.531128874

Subproblem 2

x + 0.5 = -4.031128874 Simplifying x + 0.5 = -4.031128874 Reorder the terms: 0.5 + x = -4.031128874 Solving 0.5 + x = -4.031128874 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 = -4.031128874 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -4.031128874 + -0.5 x = -4.031128874 + -0.5 Combine like terms: -4.031128874 + -0.5 = -4.531128874 x = -4.531128874 Simplifying x = -4.531128874

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.531128874, -4.531128874}

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