4.5=x^2+12x

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Solution for 4.5=x^2+12x equation:


Simplifying
4.5 = x2 + 12x

Reorder the terms:
4.5 = 12x + x2

Solving
4.5 = 12x + x2

Solving for variable 'x'.

Reorder the terms:
4.5 + -12x + -1x2 = 12x + -12x + x2 + -1x2

Combine like terms: 12x + -12x = 0
4.5 + -12x + -1x2 = 0 + x2 + -1x2
4.5 + -12x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
4.5 + -12x + -1x2 = 0

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

Divide each side by '-1'.
-4.5 + 12x + x2 = 0

Move the constant term to the right:

Add '4.5' to each side of the equation.
-4.5 + 12x + 4.5 + x2 = 0 + 4.5

Reorder the terms:
-4.5 + 4.5 + 12x + x2 = 0 + 4.5

Combine like terms: -4.5 + 4.5 = 0.0
0.0 + 12x + x2 = 0 + 4.5
12x + x2 = 0 + 4.5

Combine like terms: 0 + 4.5 = 4.5
12x + x2 = 4.5

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 = 4.5 + 36

Reorder the terms:
36 + 12x + x2 = 4.5 + 36

Combine like terms: 4.5 + 36 = 40.5
36 + 12x + x2 = 40.5

Factor a perfect square on the left side:
(x + 6)(x + 6) = 40.5

Calculate the square root of the right side: 6.363961031

Break this problem into two subproblems by setting 
(x + 6) equal to 6.363961031 and -6.363961031.

Subproblem 1

x + 6 = 6.363961031 Simplifying x + 6 = 6.363961031 Reorder the terms: 6 + x = 6.363961031 Solving 6 + x = 6.363961031 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 = 6.363961031 + -6 Combine like terms: 6 + -6 = 0 0 + x = 6.363961031 + -6 x = 6.363961031 + -6 Combine like terms: 6.363961031 + -6 = 0.363961031 x = 0.363961031 Simplifying x = 0.363961031

Subproblem 2

x + 6 = -6.363961031 Simplifying x + 6 = -6.363961031 Reorder the terms: 6 + x = -6.363961031 Solving 6 + x = -6.363961031 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 = -6.363961031 + -6 Combine like terms: 6 + -6 = 0 0 + x = -6.363961031 + -6 x = -6.363961031 + -6 Combine like terms: -6.363961031 + -6 = -12.363961031 x = -12.363961031 Simplifying x = -12.363961031

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.363961031, -12.363961031}

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