500=1.36x^2+27.8x+30

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Solution for 500=1.36x^2+27.8x+30 equation:


Simplifying
500 = 1.36x2 + 27.8x + 30

Reorder the terms:
500 = 30 + 27.8x + 1.36x2

Solving
500 = 30 + 27.8x + 1.36x2

Solving for variable 'x'.

Combine like terms: 500 + -30 = 470
470 + -27.8x + -1.36x2 = 30 + 27.8x + 1.36x2 + -30 + -27.8x + -1.36x2

Reorder the terms:
470 + -27.8x + -1.36x2 = 30 + -30 + 27.8x + -27.8x + 1.36x2 + -1.36x2

Combine like terms: 30 + -30 = 0
470 + -27.8x + -1.36x2 = 0 + 27.8x + -27.8x + 1.36x2 + -1.36x2
470 + -27.8x + -1.36x2 = 27.8x + -27.8x + 1.36x2 + -1.36x2

Combine like terms: 27.8x + -27.8x = 0.0
470 + -27.8x + -1.36x2 = 0.0 + 1.36x2 + -1.36x2
470 + -27.8x + -1.36x2 = 1.36x2 + -1.36x2

Combine like terms: 1.36x2 + -1.36x2 = 0.00
470 + -27.8x + -1.36x2 = 0.00

Begin completing the square.  Divide all terms by
-1.36 the coefficient of the squared term: 

Divide each side by '-1.36'.
-345.5882353 + 20.44117647x + x2 = 0

Move the constant term to the right:

Add '345.5882353' to each side of the equation.
-345.5882353 + 20.44117647x + 345.5882353 + x2 = 0 + 345.5882353

Reorder the terms:
-345.5882353 + 345.5882353 + 20.44117647x + x2 = 0 + 345.5882353

Combine like terms: -345.5882353 + 345.5882353 = 0.0000000
0.0000000 + 20.44117647x + x2 = 0 + 345.5882353
20.44117647x + x2 = 0 + 345.5882353

Combine like terms: 0 + 345.5882353 = 345.5882353
20.44117647x + x2 = 345.5882353

The x term is 20.44117647x.  Take half its coefficient (10.22058824).
Square it (104.4604240) and add it to both sides.

Add '104.4604240' to each side of the equation.
20.44117647x + 104.4604240 + x2 = 345.5882353 + 104.4604240

Reorder the terms:
104.4604240 + 20.44117647x + x2 = 345.5882353 + 104.4604240

Combine like terms: 345.5882353 + 104.4604240 = 450.0486593
104.4604240 + 20.44117647x + x2 = 450.0486593

Factor a perfect square on the left side:
(x + 10.22058824)(x + 10.22058824) = 450.0486593

Calculate the square root of the right side: 21.214350315

Break this problem into two subproblems by setting 
(x + 10.22058824) equal to 21.214350315 and -21.214350315.

Subproblem 1

x + 10.22058824 = 21.214350315 Simplifying x + 10.22058824 = 21.214350315 Reorder the terms: 10.22058824 + x = 21.214350315 Solving 10.22058824 + x = 21.214350315 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10.22058824' to each side of the equation. 10.22058824 + -10.22058824 + x = 21.214350315 + -10.22058824 Combine like terms: 10.22058824 + -10.22058824 = 0.00000000 0.00000000 + x = 21.214350315 + -10.22058824 x = 21.214350315 + -10.22058824 Combine like terms: 21.214350315 + -10.22058824 = 10.993762075 x = 10.993762075 Simplifying x = 10.993762075

Subproblem 2

x + 10.22058824 = -21.214350315 Simplifying x + 10.22058824 = -21.214350315 Reorder the terms: 10.22058824 + x = -21.214350315 Solving 10.22058824 + x = -21.214350315 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10.22058824' to each side of the equation. 10.22058824 + -10.22058824 + x = -21.214350315 + -10.22058824 Combine like terms: 10.22058824 + -10.22058824 = 0.00000000 0.00000000 + x = -21.214350315 + -10.22058824 x = -21.214350315 + -10.22058824 Combine like terms: -21.214350315 + -10.22058824 = -31.434938555 x = -31.434938555 Simplifying x = -31.434938555

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.993762075, -31.434938555}

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