.5x^2+28x-369=0

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Solution for .5x^2+28x-369=0 equation:


Simplifying
0.5x2 + 28x + -369 = 0

Reorder the terms:
-369 + 28x + 0.5x2 = 0

Solving
-369 + 28x + 0.5x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.5'.
-738 + 56x + x2 = 0

Move the constant term to the right:

Add '738' to each side of the equation.
-738 + 56x + 738 + x2 = 0 + 738

Reorder the terms:
-738 + 738 + 56x + x2 = 0 + 738

Combine like terms: -738 + 738 = 0
0 + 56x + x2 = 0 + 738
56x + x2 = 0 + 738

Combine like terms: 0 + 738 = 738
56x + x2 = 738

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 = 738 + 784

Reorder the terms:
784 + 56x + x2 = 738 + 784

Combine like terms: 738 + 784 = 1522
784 + 56x + x2 = 1522

Factor a perfect square on the left side:
(x + 28)(x + 28) = 1522

Calculate the square root of the right side: 39.012818406

Break this problem into two subproblems by setting 
(x + 28) equal to 39.012818406 and -39.012818406.

Subproblem 1

x + 28 = 39.012818406 Simplifying x + 28 = 39.012818406 Reorder the terms: 28 + x = 39.012818406 Solving 28 + x = 39.012818406 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 = 39.012818406 + -28 Combine like terms: 28 + -28 = 0 0 + x = 39.012818406 + -28 x = 39.012818406 + -28 Combine like terms: 39.012818406 + -28 = 11.012818406 x = 11.012818406 Simplifying x = 11.012818406

Subproblem 2

x + 28 = -39.012818406 Simplifying x + 28 = -39.012818406 Reorder the terms: 28 + x = -39.012818406 Solving 28 + x = -39.012818406 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 = -39.012818406 + -28 Combine like terms: 28 + -28 = 0 0 + x = -39.012818406 + -28 x = -39.012818406 + -28 Combine like terms: -39.012818406 + -28 = -67.012818406 x = -67.012818406 Simplifying x = -67.012818406

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.012818406, -67.012818406}

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