300=243.6x-0.5x^2

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Solution for 300=243.6x-0.5x^2 equation:


Simplifying
300 = 243.6x + -0.5x2

Solving
300 = 243.6x + -0.5x2

Solving for variable 'x'.

Reorder the terms:
300 + -243.6x + 0.5x2 = 243.6x + -243.6x + -0.5x2 + 0.5x2

Combine like terms: 243.6x + -243.6x = 0.0
300 + -243.6x + 0.5x2 = 0.0 + -0.5x2 + 0.5x2
300 + -243.6x + 0.5x2 = -0.5x2 + 0.5x2

Combine like terms: -0.5x2 + 0.5x2 = 0.0
300 + -243.6x + 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'.
600 + -487.2x + x2 = 0

Move the constant term to the right:

Add '-600' to each side of the equation.
600 + -487.2x + -600 + x2 = 0 + -600

Reorder the terms:
600 + -600 + -487.2x + x2 = 0 + -600

Combine like terms: 600 + -600 = 0
0 + -487.2x + x2 = 0 + -600
-487.2x + x2 = 0 + -600

Combine like terms: 0 + -600 = -600
-487.2x + x2 = -600

The x term is -487.2x.  Take half its coefficient (-243.6).
Square it (59340.96) and add it to both sides.

Add '59340.96' to each side of the equation.
-487.2x + 59340.96 + x2 = -600 + 59340.96

Reorder the terms:
59340.96 + -487.2x + x2 = -600 + 59340.96

Combine like terms: -600 + 59340.96 = 58740.96
59340.96 + -487.2x + x2 = 58740.96

Factor a perfect square on the left side:
(x + -243.6)(x + -243.6) = 58740.96

Calculate the square root of the right side: 242.365344057

Break this problem into two subproblems by setting 
(x + -243.6) equal to 242.365344057 and -242.365344057.

Subproblem 1

x + -243.6 = 242.365344057 Simplifying x + -243.6 = 242.365344057 Reorder the terms: -243.6 + x = 242.365344057 Solving -243.6 + x = 242.365344057 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '243.6' to each side of the equation. -243.6 + 243.6 + x = 242.365344057 + 243.6 Combine like terms: -243.6 + 243.6 = 0.0 0.0 + x = 242.365344057 + 243.6 x = 242.365344057 + 243.6 Combine like terms: 242.365344057 + 243.6 = 485.965344057 x = 485.965344057 Simplifying x = 485.965344057

Subproblem 2

x + -243.6 = -242.365344057 Simplifying x + -243.6 = -242.365344057 Reorder the terms: -243.6 + x = -242.365344057 Solving -243.6 + x = -242.365344057 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '243.6' to each side of the equation. -243.6 + 243.6 + x = -242.365344057 + 243.6 Combine like terms: -243.6 + 243.6 = 0.0 0.0 + x = -242.365344057 + 243.6 x = -242.365344057 + 243.6 Combine like terms: -242.365344057 + 243.6 = 1.234655943 x = 1.234655943 Simplifying x = 1.234655943

Solution

The solution to the problem is based on the solutions from the subproblems. x = {485.965344057, 1.234655943}

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