575=1.36x^2+27.8x

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Solution for 575=1.36x^2+27.8x equation:


Simplifying
575 = 1.36x2 + 27.8x

Reorder the terms:
575 = 27.8x + 1.36x2

Solving
575 = 27.8x + 1.36x2

Solving for variable 'x'.

Reorder the terms:
575 + -27.8x + -1.36x2 = 27.8x + -27.8x + 1.36x2 + -1.36x2

Combine like terms: 27.8x + -27.8x = 0.0
575 + -27.8x + -1.36x2 = 0.0 + 1.36x2 + -1.36x2
575 + -27.8x + -1.36x2 = 1.36x2 + -1.36x2

Combine like terms: 1.36x2 + -1.36x2 = 0.00
575 + -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'.
-422.7941176 + 20.44117647x + x2 = 0

Move the constant term to the right:

Add '422.7941176' to each side of the equation.
-422.7941176 + 20.44117647x + 422.7941176 + x2 = 0 + 422.7941176

Reorder the terms:
-422.7941176 + 422.7941176 + 20.44117647x + x2 = 0 + 422.7941176

Combine like terms: -422.7941176 + 422.7941176 = 0.0000000
0.0000000 + 20.44117647x + x2 = 0 + 422.7941176
20.44117647x + x2 = 0 + 422.7941176

Combine like terms: 0 + 422.7941176 = 422.7941176
20.44117647x + x2 = 422.7941176

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 = 422.7941176 + 104.4604240

Reorder the terms:
104.4604240 + 20.44117647x + x2 = 422.7941176 + 104.4604240

Combine like terms: 422.7941176 + 104.4604240 = 527.2545416
104.4604240 + 20.44117647x + x2 = 527.2545416

Factor a perfect square on the left side:
(x + 10.22058824)(x + 10.22058824) = 527.2545416

Calculate the square root of the right side: 22.9620239

Break this problem into two subproblems by setting 
(x + 10.22058824) equal to 22.9620239 and -22.9620239.

Subproblem 1

x + 10.22058824 = 22.9620239 Simplifying x + 10.22058824 = 22.9620239 Reorder the terms: 10.22058824 + x = 22.9620239 Solving 10.22058824 + x = 22.9620239 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 = 22.9620239 + -10.22058824 Combine like terms: 10.22058824 + -10.22058824 = 0.00000000 0.00000000 + x = 22.9620239 + -10.22058824 x = 22.9620239 + -10.22058824 Combine like terms: 22.9620239 + -10.22058824 = 12.74143566 x = 12.74143566 Simplifying x = 12.74143566

Subproblem 2

x + 10.22058824 = -22.9620239 Simplifying x + 10.22058824 = -22.9620239 Reorder the terms: 10.22058824 + x = -22.9620239 Solving 10.22058824 + x = -22.9620239 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 = -22.9620239 + -10.22058824 Combine like terms: 10.22058824 + -10.22058824 = 0.00000000 0.00000000 + x = -22.9620239 + -10.22058824 x = -22.9620239 + -10.22058824 Combine like terms: -22.9620239 + -10.22058824 = -33.18261214 x = -33.18261214 Simplifying x = -33.18261214

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.74143566, -33.18261214}

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