(5-3x)(5+3x)=x

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Solution for (5-3x)(5+3x)=x equation:


Simplifying
(5 + -3x)(5 + 3x) = x

Multiply (5 + -3x) * (5 + 3x)
(5(5 + 3x) + -3x * (5 + 3x)) = x
((5 * 5 + 3x * 5) + -3x * (5 + 3x)) = x
((25 + 15x) + -3x * (5 + 3x)) = x
(25 + 15x + (5 * -3x + 3x * -3x)) = x
(25 + 15x + (-15x + -9x2)) = x

Combine like terms: 15x + -15x = 0
(25 + 0 + -9x2) = x
(25 + -9x2) = x

Solving
25 + -9x2 = x

Solving for variable 'x'.

Reorder the terms:
25 + -1x + -9x2 = x + -1x

Combine like terms: x + -1x = 0
25 + -1x + -9x2 = 0

Begin completing the square.  Divide all terms by
-9 the coefficient of the squared term: 

Divide each side by '-9'.
-2.777777778 + 0.1111111111x + x2 = 0

Move the constant term to the right:

Add '2.777777778' to each side of the equation.
-2.777777778 + 0.1111111111x + 2.777777778 + x2 = 0 + 2.777777778

Reorder the terms:
-2.777777778 + 2.777777778 + 0.1111111111x + x2 = 0 + 2.777777778

Combine like terms: -2.777777778 + 2.777777778 = 0.000000000
0.000000000 + 0.1111111111x + x2 = 0 + 2.777777778
0.1111111111x + x2 = 0 + 2.777777778

Combine like terms: 0 + 2.777777778 = 2.777777778
0.1111111111x + x2 = 2.777777778

The x term is 0.1111111111x.  Take half its coefficient (0.05555555555).
Square it (0.003086419752) and add it to both sides.

Add '0.003086419752' to each side of the equation.
0.1111111111x + 0.003086419752 + x2 = 2.777777778 + 0.003086419752

Reorder the terms:
0.003086419752 + 0.1111111111x + x2 = 2.777777778 + 0.003086419752

Combine like terms: 2.777777778 + 0.003086419752 = 2.780864197752
0.003086419752 + 0.1111111111x + x2 = 2.780864197752

Factor a perfect square on the left side:
(x + 0.05555555555)(x + 0.05555555555) = 2.780864197752

Calculate the square root of the right side: 1.667592336

Break this problem into two subproblems by setting 
(x + 0.05555555555) equal to 1.667592336 and -1.667592336.

Subproblem 1

x + 0.05555555555 = 1.667592336 Simplifying x + 0.05555555555 = 1.667592336 Reorder the terms: 0.05555555555 + x = 1.667592336 Solving 0.05555555555 + x = 1.667592336 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.05555555555' to each side of the equation. 0.05555555555 + -0.05555555555 + x = 1.667592336 + -0.05555555555 Combine like terms: 0.05555555555 + -0.05555555555 = 0.00000000000 0.00000000000 + x = 1.667592336 + -0.05555555555 x = 1.667592336 + -0.05555555555 Combine like terms: 1.667592336 + -0.05555555555 = 1.61203678045 x = 1.61203678045 Simplifying x = 1.61203678045

Subproblem 2

x + 0.05555555555 = -1.667592336 Simplifying x + 0.05555555555 = -1.667592336 Reorder the terms: 0.05555555555 + x = -1.667592336 Solving 0.05555555555 + x = -1.667592336 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.05555555555' to each side of the equation. 0.05555555555 + -0.05555555555 + x = -1.667592336 + -0.05555555555 Combine like terms: 0.05555555555 + -0.05555555555 = 0.00000000000 0.00000000000 + x = -1.667592336 + -0.05555555555 x = -1.667592336 + -0.05555555555 Combine like terms: -1.667592336 + -0.05555555555 = -1.72314789155 x = -1.72314789155 Simplifying x = -1.72314789155

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.61203678045, -1.72314789155}

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