(x-3)(x+3)=(x+36)

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Solution for (x-3)(x+3)=(x+36) equation:


Simplifying
(x + -3)(x + 3) = (x + 36)

Reorder the terms:
(-3 + x)(x + 3) = (x + 36)

Reorder the terms:
(-3 + x)(3 + x) = (x + 36)

Multiply (-3 + x) * (3 + x)
(-3(3 + x) + x(3 + x)) = (x + 36)
((3 * -3 + x * -3) + x(3 + x)) = (x + 36)
((-9 + -3x) + x(3 + x)) = (x + 36)
(-9 + -3x + (3 * x + x * x)) = (x + 36)
(-9 + -3x + (3x + x2)) = (x + 36)

Combine like terms: -3x + 3x = 0
(-9 + 0 + x2) = (x + 36)
(-9 + x2) = (x + 36)

Reorder the terms:
-9 + x2 = (36 + x)

Remove parenthesis around (36 + x)
-9 + x2 = 36 + x

Solving
-9 + x2 = 36 + x

Solving for variable 'x'.

Reorder the terms:
-9 + -36 + -1x + x2 = 36 + x + -36 + -1x

Combine like terms: -9 + -36 = -45
-45 + -1x + x2 = 36 + x + -36 + -1x

Reorder the terms:
-45 + -1x + x2 = 36 + -36 + x + -1x

Combine like terms: 36 + -36 = 0
-45 + -1x + x2 = 0 + x + -1x
-45 + -1x + x2 = x + -1x

Combine like terms: x + -1x = 0
-45 + -1x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '45' to each side of the equation.
-45 + -1x + 45 + x2 = 0 + 45

Reorder the terms:
-45 + 45 + -1x + x2 = 0 + 45

Combine like terms: -45 + 45 = 0
0 + -1x + x2 = 0 + 45
-1x + x2 = 0 + 45

Combine like terms: 0 + 45 = 45
-1x + x2 = 45

The x term is -1x.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1x + 0.25 + x2 = 45 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 45 + 0.25

Combine like terms: 45 + 0.25 = 45.25
0.25 + -1x + x2 = 45.25

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = 45.25

Calculate the square root of the right side: 6.726812024

Break this problem into two subproblems by setting 
(x + -0.5) equal to 6.726812024 and -6.726812024.

Subproblem 1

x + -0.5 = 6.726812024 Simplifying x + -0.5 = 6.726812024 Reorder the terms: -0.5 + x = 6.726812024 Solving -0.5 + x = 6.726812024 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = 6.726812024 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 6.726812024 + 0.5 x = 6.726812024 + 0.5 Combine like terms: 6.726812024 + 0.5 = 7.226812024 x = 7.226812024 Simplifying x = 7.226812024

Subproblem 2

x + -0.5 = -6.726812024 Simplifying x + -0.5 = -6.726812024 Reorder the terms: -0.5 + x = -6.726812024 Solving -0.5 + x = -6.726812024 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = -6.726812024 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -6.726812024 + 0.5 x = -6.726812024 + 0.5 Combine like terms: -6.726812024 + 0.5 = -6.226812024 x = -6.226812024 Simplifying x = -6.226812024

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.226812024, -6.226812024}

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