30=-0.5x^2+36x-132

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Solution for 30=-0.5x^2+36x-132 equation:


Simplifying
30 = -0.5x2 + 36x + -132

Reorder the terms:
30 = -132 + 36x + -0.5x2

Solving
30 = -132 + 36x + -0.5x2

Solving for variable 'x'.

Combine like terms: 30 + 132 = 162
162 + -36x + 0.5x2 = -132 + 36x + -0.5x2 + 132 + -36x + 0.5x2

Reorder the terms:
162 + -36x + 0.5x2 = -132 + 132 + 36x + -36x + -0.5x2 + 0.5x2

Combine like terms: -132 + 132 = 0
162 + -36x + 0.5x2 = 0 + 36x + -36x + -0.5x2 + 0.5x2
162 + -36x + 0.5x2 = 36x + -36x + -0.5x2 + 0.5x2

Combine like terms: 36x + -36x = 0
162 + -36x + 0.5x2 = 0 + -0.5x2 + 0.5x2
162 + -36x + 0.5x2 = -0.5x2 + 0.5x2

Combine like terms: -0.5x2 + 0.5x2 = 0.0
162 + -36x + 0.5x2 = 0.0

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

Divide each side by '0.5'.
324 + -72x + x2 = 0

Move the constant term to the right:

Add '-324' to each side of the equation.
324 + -72x + -324 + x2 = 0 + -324

Reorder the terms:
324 + -324 + -72x + x2 = 0 + -324

Combine like terms: 324 + -324 = 0
0 + -72x + x2 = 0 + -324
-72x + x2 = 0 + -324

Combine like terms: 0 + -324 = -324
-72x + x2 = -324

The x term is -72x.  Take half its coefficient (-36).
Square it (1296) and add it to both sides.

Add '1296' to each side of the equation.
-72x + 1296 + x2 = -324 + 1296

Reorder the terms:
1296 + -72x + x2 = -324 + 1296

Combine like terms: -324 + 1296 = 972
1296 + -72x + x2 = 972

Factor a perfect square on the left side:
(x + -36)(x + -36) = 972

Calculate the square root of the right side: 31.176914536

Break this problem into two subproblems by setting 
(x + -36) equal to 31.176914536 and -31.176914536.

Subproblem 1

x + -36 = 31.176914536 Simplifying x + -36 = 31.176914536 Reorder the terms: -36 + x = 31.176914536 Solving -36 + x = 31.176914536 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '36' to each side of the equation. -36 + 36 + x = 31.176914536 + 36 Combine like terms: -36 + 36 = 0 0 + x = 31.176914536 + 36 x = 31.176914536 + 36 Combine like terms: 31.176914536 + 36 = 67.176914536 x = 67.176914536 Simplifying x = 67.176914536

Subproblem 2

x + -36 = -31.176914536 Simplifying x + -36 = -31.176914536 Reorder the terms: -36 + x = -31.176914536 Solving -36 + x = -31.176914536 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '36' to each side of the equation. -36 + 36 + x = -31.176914536 + 36 Combine like terms: -36 + 36 = 0 0 + x = -31.176914536 + 36 x = -31.176914536 + 36 Combine like terms: -31.176914536 + 36 = 4.823085464 x = 4.823085464 Simplifying x = 4.823085464

Solution

The solution to the problem is based on the solutions from the subproblems. x = {67.176914536, 4.823085464}

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