300-56x-x^2=0

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Solution for 300-56x-x^2=0 equation:


Simplifying
300 + -56x + -1x2 = 0

Solving
300 + -56x + -1x2 = 0

Solving for variable 'x'.

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

Divide each side by '-1'.
-300 + 56x + x2 = 0

Move the constant term to the right:

Add '300' to each side of the equation.
-300 + 56x + 300 + x2 = 0 + 300

Reorder the terms:
-300 + 300 + 56x + x2 = 0 + 300

Combine like terms: -300 + 300 = 0
0 + 56x + x2 = 0 + 300
56x + x2 = 0 + 300

Combine like terms: 0 + 300 = 300
56x + x2 = 300

The x term is 56x.  Take half its coefficient (28).
Square it (784) and add it to both sides.

Add '784' to each side of the equation.
56x + 784 + x2 = 300 + 784

Reorder the terms:
784 + 56x + x2 = 300 + 784

Combine like terms: 300 + 784 = 1084
784 + 56x + x2 = 1084

Factor a perfect square on the left side:
(x + 28)(x + 28) = 1084

Calculate the square root of the right side: 32.924155266

Break this problem into two subproblems by setting 
(x + 28) equal to 32.924155266 and -32.924155266.

Subproblem 1

x + 28 = 32.924155266 Simplifying x + 28 = 32.924155266 Reorder the terms: 28 + x = 32.924155266 Solving 28 + x = 32.924155266 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-28' to each side of the equation. 28 + -28 + x = 32.924155266 + -28 Combine like terms: 28 + -28 = 0 0 + x = 32.924155266 + -28 x = 32.924155266 + -28 Combine like terms: 32.924155266 + -28 = 4.924155266 x = 4.924155266 Simplifying x = 4.924155266

Subproblem 2

x + 28 = -32.924155266 Simplifying x + 28 = -32.924155266 Reorder the terms: 28 + x = -32.924155266 Solving 28 + x = -32.924155266 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-28' to each side of the equation. 28 + -28 + x = -32.924155266 + -28 Combine like terms: 28 + -28 = 0 0 + x = -32.924155266 + -28 x = -32.924155266 + -28 Combine like terms: -32.924155266 + -28 = -60.924155266 x = -60.924155266 Simplifying x = -60.924155266

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.924155266, -60.924155266}

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