60-x^2=x^2+9x+30

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Solution for 60-x^2=x^2+9x+30 equation:


Simplifying
60 + -1x2 = x2 + 9x + 30

Reorder the terms:
60 + -1x2 = 30 + 9x + x2

Solving
60 + -1x2 = 30 + 9x + x2

Solving for variable 'x'.

Reorder the terms:
60 + -30 + -9x + -1x2 + -1x2 = 30 + 9x + x2 + -30 + -9x + -1x2

Combine like terms: 60 + -30 = 30
30 + -9x + -1x2 + -1x2 = 30 + 9x + x2 + -30 + -9x + -1x2

Combine like terms: -1x2 + -1x2 = -2x2
30 + -9x + -2x2 = 30 + 9x + x2 + -30 + -9x + -1x2

Reorder the terms:
30 + -9x + -2x2 = 30 + -30 + 9x + -9x + x2 + -1x2

Combine like terms: 30 + -30 = 0
30 + -9x + -2x2 = 0 + 9x + -9x + x2 + -1x2
30 + -9x + -2x2 = 9x + -9x + x2 + -1x2

Combine like terms: 9x + -9x = 0
30 + -9x + -2x2 = 0 + x2 + -1x2
30 + -9x + -2x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
30 + -9x + -2x2 = 0

Begin completing the square.  Divide all terms by
-2 the coefficient of the squared term: 

Divide each side by '-2'.
-15 + 4.5x + x2 = 0

Move the constant term to the right:

Add '15' to each side of the equation.
-15 + 4.5x + 15 + x2 = 0 + 15

Reorder the terms:
-15 + 15 + 4.5x + x2 = 0 + 15

Combine like terms: -15 + 15 = 0
0 + 4.5x + x2 = 0 + 15
4.5x + x2 = 0 + 15

Combine like terms: 0 + 15 = 15
4.5x + x2 = 15

The x term is 4.5x.  Take half its coefficient (2.25).
Square it (5.0625) and add it to both sides.

Add '5.0625' to each side of the equation.
4.5x + 5.0625 + x2 = 15 + 5.0625

Reorder the terms:
5.0625 + 4.5x + x2 = 15 + 5.0625

Combine like terms: 15 + 5.0625 = 20.0625
5.0625 + 4.5x + x2 = 20.0625

Factor a perfect square on the left side:
(x + 2.25)(x + 2.25) = 20.0625

Calculate the square root of the right side: 4.479118217

Break this problem into two subproblems by setting 
(x + 2.25) equal to 4.479118217 and -4.479118217.

Subproblem 1

x + 2.25 = 4.479118217 Simplifying x + 2.25 = 4.479118217 Reorder the terms: 2.25 + x = 4.479118217 Solving 2.25 + x = 4.479118217 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.25' to each side of the equation. 2.25 + -2.25 + x = 4.479118217 + -2.25 Combine like terms: 2.25 + -2.25 = 0.00 0.00 + x = 4.479118217 + -2.25 x = 4.479118217 + -2.25 Combine like terms: 4.479118217 + -2.25 = 2.229118217 x = 2.229118217 Simplifying x = 2.229118217

Subproblem 2

x + 2.25 = -4.479118217 Simplifying x + 2.25 = -4.479118217 Reorder the terms: 2.25 + x = -4.479118217 Solving 2.25 + x = -4.479118217 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.25' to each side of the equation. 2.25 + -2.25 + x = -4.479118217 + -2.25 Combine like terms: 2.25 + -2.25 = 0.00 0.00 + x = -4.479118217 + -2.25 x = -4.479118217 + -2.25 Combine like terms: -4.479118217 + -2.25 = -6.729118217 x = -6.729118217 Simplifying x = -6.729118217

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.229118217, -6.729118217}

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