(5x+6)(5x-6)=-5x

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Solution for (5x+6)(5x-6)=-5x equation:


Simplifying
(5x + 6)(5x + -6) = -5x

Reorder the terms:
(6 + 5x)(5x + -6) = -5x

Reorder the terms:
(6 + 5x)(-6 + 5x) = -5x

Multiply (6 + 5x) * (-6 + 5x)
(6(-6 + 5x) + 5x * (-6 + 5x)) = -5x
((-6 * 6 + 5x * 6) + 5x * (-6 + 5x)) = -5x
((-36 + 30x) + 5x * (-6 + 5x)) = -5x
(-36 + 30x + (-6 * 5x + 5x * 5x)) = -5x
(-36 + 30x + (-30x + 25x2)) = -5x

Combine like terms: 30x + -30x = 0
(-36 + 0 + 25x2) = -5x
(-36 + 25x2) = -5x

Solving
-36 + 25x2 = -5x

Solving for variable 'x'.

Reorder the terms:
-36 + 5x + 25x2 = -5x + 5x

Combine like terms: -5x + 5x = 0
-36 + 5x + 25x2 = 0

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

Divide each side by '25'.
-1.44 + 0.2x + x2 = 0

Move the constant term to the right:

Add '1.44' to each side of the equation.
-1.44 + 0.2x + 1.44 + x2 = 0 + 1.44

Reorder the terms:
-1.44 + 1.44 + 0.2x + x2 = 0 + 1.44

Combine like terms: -1.44 + 1.44 = 0.00
0.00 + 0.2x + x2 = 0 + 1.44
0.2x + x2 = 0 + 1.44

Combine like terms: 0 + 1.44 = 1.44
0.2x + x2 = 1.44

The x term is 0.2x.  Take half its coefficient (0.1).
Square it (0.01) and add it to both sides.

Add '0.01' to each side of the equation.
0.2x + 0.01 + x2 = 1.44 + 0.01

Reorder the terms:
0.01 + 0.2x + x2 = 1.44 + 0.01

Combine like terms: 1.44 + 0.01 = 1.45
0.01 + 0.2x + x2 = 1.45

Factor a perfect square on the left side:
(x + 0.1)(x + 0.1) = 1.45

Calculate the square root of the right side: 1.204159458

Break this problem into two subproblems by setting 
(x + 0.1) equal to 1.204159458 and -1.204159458.

Subproblem 1

x + 0.1 = 1.204159458 Simplifying x + 0.1 = 1.204159458 Reorder the terms: 0.1 + x = 1.204159458 Solving 0.1 + x = 1.204159458 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1' to each side of the equation. 0.1 + -0.1 + x = 1.204159458 + -0.1 Combine like terms: 0.1 + -0.1 = 0.0 0.0 + x = 1.204159458 + -0.1 x = 1.204159458 + -0.1 Combine like terms: 1.204159458 + -0.1 = 1.104159458 x = 1.104159458 Simplifying x = 1.104159458

Subproblem 2

x + 0.1 = -1.204159458 Simplifying x + 0.1 = -1.204159458 Reorder the terms: 0.1 + x = -1.204159458 Solving 0.1 + x = -1.204159458 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1' to each side of the equation. 0.1 + -0.1 + x = -1.204159458 + -0.1 Combine like terms: 0.1 + -0.1 = 0.0 0.0 + x = -1.204159458 + -0.1 x = -1.204159458 + -0.1 Combine like terms: -1.204159458 + -0.1 = -1.304159458 x = -1.304159458 Simplifying x = -1.304159458

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.104159458, -1.304159458}

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