65-x^2=4x

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Solution for 65-x^2=4x equation:


Simplifying
65 + -1x2 = 4x

Solving
65 + -1x2 = 4x

Solving for variable 'x'.

Reorder the terms:
65 + -4x + -1x2 = 4x + -4x

Combine like terms: 4x + -4x = 0
65 + -4x + -1x2 = 0

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

Divide each side by '-1'.
-65 + 4x + x2 = 0

Move the constant term to the right:

Add '65' to each side of the equation.
-65 + 4x + 65 + x2 = 0 + 65

Reorder the terms:
-65 + 65 + 4x + x2 = 0 + 65

Combine like terms: -65 + 65 = 0
0 + 4x + x2 = 0 + 65
4x + x2 = 0 + 65

Combine like terms: 0 + 65 = 65
4x + x2 = 65

The x term is 4x.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x + 4 + x2 = 65 + 4

Reorder the terms:
4 + 4x + x2 = 65 + 4

Combine like terms: 65 + 4 = 69
4 + 4x + x2 = 69

Factor a perfect square on the left side:
(x + 2)(x + 2) = 69

Calculate the square root of the right side: 8.306623863

Break this problem into two subproblems by setting 
(x + 2) equal to 8.306623863 and -8.306623863.

Subproblem 1

x + 2 = 8.306623863 Simplifying x + 2 = 8.306623863 Reorder the terms: 2 + x = 8.306623863 Solving 2 + x = 8.306623863 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 8.306623863 + -2 Combine like terms: 2 + -2 = 0 0 + x = 8.306623863 + -2 x = 8.306623863 + -2 Combine like terms: 8.306623863 + -2 = 6.306623863 x = 6.306623863 Simplifying x = 6.306623863

Subproblem 2

x + 2 = -8.306623863 Simplifying x + 2 = -8.306623863 Reorder the terms: 2 + x = -8.306623863 Solving 2 + x = -8.306623863 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -8.306623863 + -2 Combine like terms: 2 + -2 = 0 0 + x = -8.306623863 + -2 x = -8.306623863 + -2 Combine like terms: -8.306623863 + -2 = -10.306623863 x = -10.306623863 Simplifying x = -10.306623863

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.306623863, -10.306623863}

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