3-x^2=5x

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Solution for 3-x^2=5x equation:


Simplifying
3 + -1x2 = 5x

Solving
3 + -1x2 = 5x

Solving for variable 'x'.

Reorder the terms:
3 + -5x + -1x2 = 5x + -5x

Combine like terms: 5x + -5x = 0
3 + -5x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-3 + 5x + x2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + 5x + 3 + x2 = 0 + 3

Reorder the terms:
-3 + 3 + 5x + x2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + 5x + x2 = 0 + 3
5x + x2 = 0 + 3

Combine like terms: 0 + 3 = 3
5x + x2 = 3

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 = 3 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 3 + 6.25

Combine like terms: 3 + 6.25 = 9.25
6.25 + 5x + x2 = 9.25

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 9.25

Calculate the square root of the right side: 3.041381265

Break this problem into two subproblems by setting 
(x + 2.5) equal to 3.041381265 and -3.041381265.

Subproblem 1

x + 2.5 = 3.041381265 Simplifying x + 2.5 = 3.041381265 Reorder the terms: 2.5 + x = 3.041381265 Solving 2.5 + x = 3.041381265 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 = 3.041381265 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 3.041381265 + -2.5 x = 3.041381265 + -2.5 Combine like terms: 3.041381265 + -2.5 = 0.541381265 x = 0.541381265 Simplifying x = 0.541381265

Subproblem 2

x + 2.5 = -3.041381265 Simplifying x + 2.5 = -3.041381265 Reorder the terms: 2.5 + x = -3.041381265 Solving 2.5 + x = -3.041381265 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 = -3.041381265 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -3.041381265 + -2.5 x = -3.041381265 + -2.5 Combine like terms: -3.041381265 + -2.5 = -5.541381265 x = -5.541381265 Simplifying x = -5.541381265

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.541381265, -5.541381265}

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