4.6x=4-x^2

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Solution for 4.6x=4-x^2 equation:


Simplifying
4.6x = 4 + -1x2

Solving
4.6x = 4 + -1x2

Solving for variable 'x'.

Reorder the terms:
-4 + 4.6x + x2 = 4 + -1x2 + -4 + x2

Reorder the terms:
-4 + 4.6x + x2 = 4 + -4 + -1x2 + x2

Combine like terms: 4 + -4 = 0
-4 + 4.6x + x2 = 0 + -1x2 + x2
-4 + 4.6x + x2 = -1x2 + x2

Combine like terms: -1x2 + x2 = 0
-4 + 4.6x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + 4.6x + 4 + x2 = 0 + 4

Reorder the terms:
-4 + 4 + 4.6x + x2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + 4.6x + x2 = 0 + 4
4.6x + x2 = 0 + 4

Combine like terms: 0 + 4 = 4
4.6x + x2 = 4

The x term is 4.6x.  Take half its coefficient (2.3).
Square it (5.29) and add it to both sides.

Add '5.29' to each side of the equation.
4.6x + 5.29 + x2 = 4 + 5.29

Reorder the terms:
5.29 + 4.6x + x2 = 4 + 5.29

Combine like terms: 4 + 5.29 = 9.29
5.29 + 4.6x + x2 = 9.29

Factor a perfect square on the left side:
(x + 2.3)(x + 2.3) = 9.29

Calculate the square root of the right side: 3.047950131

Break this problem into two subproblems by setting 
(x + 2.3) equal to 3.047950131 and -3.047950131.

Subproblem 1

x + 2.3 = 3.047950131 Simplifying x + 2.3 = 3.047950131 Reorder the terms: 2.3 + x = 3.047950131 Solving 2.3 + x = 3.047950131 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.3' to each side of the equation. 2.3 + -2.3 + x = 3.047950131 + -2.3 Combine like terms: 2.3 + -2.3 = 0.0 0.0 + x = 3.047950131 + -2.3 x = 3.047950131 + -2.3 Combine like terms: 3.047950131 + -2.3 = 0.747950131 x = 0.747950131 Simplifying x = 0.747950131

Subproblem 2

x + 2.3 = -3.047950131 Simplifying x + 2.3 = -3.047950131 Reorder the terms: 2.3 + x = -3.047950131 Solving 2.3 + x = -3.047950131 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.3' to each side of the equation. 2.3 + -2.3 + x = -3.047950131 + -2.3 Combine like terms: 2.3 + -2.3 = 0.0 0.0 + x = -3.047950131 + -2.3 x = -3.047950131 + -2.3 Combine like terms: -3.047950131 + -2.3 = -5.347950131 x = -5.347950131 Simplifying x = -5.347950131

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.747950131, -5.347950131}

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