(x-3)(x+3)+30=12x

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Solution for (x-3)(x+3)+30=12x equation:


Simplifying
(x + -3)(x + 3) + 30 = 12x

Reorder the terms:
(-3 + x)(x + 3) + 30 = 12x

Reorder the terms:
(-3 + x)(3 + x) + 30 = 12x

Multiply (-3 + x) * (3 + x)
(-3(3 + x) + x(3 + x)) + 30 = 12x
((3 * -3 + x * -3) + x(3 + x)) + 30 = 12x
((-9 + -3x) + x(3 + x)) + 30 = 12x
(-9 + -3x + (3 * x + x * x)) + 30 = 12x
(-9 + -3x + (3x + x2)) + 30 = 12x

Combine like terms: -3x + 3x = 0
(-9 + 0 + x2) + 30 = 12x
(-9 + x2) + 30 = 12x

Reorder the terms:
-9 + 30 + x2 = 12x

Combine like terms: -9 + 30 = 21
21 + x2 = 12x

Solving
21 + x2 = 12x

Solving for variable 'x'.

Reorder the terms:
21 + -12x + x2 = 12x + -12x

Combine like terms: 12x + -12x = 0
21 + -12x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-21' to each side of the equation.
21 + -12x + -21 + x2 = 0 + -21

Reorder the terms:
21 + -21 + -12x + x2 = 0 + -21

Combine like terms: 21 + -21 = 0
0 + -12x + x2 = 0 + -21
-12x + x2 = 0 + -21

Combine like terms: 0 + -21 = -21
-12x + x2 = -21

The x term is -12x.  Take half its coefficient (-6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
-12x + 36 + x2 = -21 + 36

Reorder the terms:
36 + -12x + x2 = -21 + 36

Combine like terms: -21 + 36 = 15
36 + -12x + x2 = 15

Factor a perfect square on the left side:
(x + -6)(x + -6) = 15

Calculate the square root of the right side: 3.872983346

Break this problem into two subproblems by setting 
(x + -6) equal to 3.872983346 and -3.872983346.

Subproblem 1

x + -6 = 3.872983346 Simplifying x + -6 = 3.872983346 Reorder the terms: -6 + x = 3.872983346 Solving -6 + x = 3.872983346 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + x = 3.872983346 + 6 Combine like terms: -6 + 6 = 0 0 + x = 3.872983346 + 6 x = 3.872983346 + 6 Combine like terms: 3.872983346 + 6 = 9.872983346 x = 9.872983346 Simplifying x = 9.872983346

Subproblem 2

x + -6 = -3.872983346 Simplifying x + -6 = -3.872983346 Reorder the terms: -6 + x = -3.872983346 Solving -6 + x = -3.872983346 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + x = -3.872983346 + 6 Combine like terms: -6 + 6 = 0 0 + x = -3.872983346 + 6 x = -3.872983346 + 6 Combine like terms: -3.872983346 + 6 = 2.127016654 x = 2.127016654 Simplifying x = 2.127016654

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.872983346, 2.127016654}

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