408=49.4x+4x+x^2

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Solution for 408=49.4x+4x+x^2 equation:


Simplifying
408 = 49.4x + 4x + x2

Combine like terms: 49.4x + 4x = 53.4x
408 = 53.4x + x2

Solving
408 = 53.4x + x2

Solving for variable 'x'.

Reorder the terms:
408 + -53.4x + -1x2 = 53.4x + -53.4x + x2 + -1x2

Combine like terms: 53.4x + -53.4x = 0.0
408 + -53.4x + -1x2 = 0.0 + x2 + -1x2
408 + -53.4x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
408 + -53.4x + -1x2 = 0

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

Divide each side by '-1'.
-408 + 53.4x + x2 = 0

Move the constant term to the right:

Add '408' to each side of the equation.
-408 + 53.4x + 408 + x2 = 0 + 408

Reorder the terms:
-408 + 408 + 53.4x + x2 = 0 + 408

Combine like terms: -408 + 408 = 0
0 + 53.4x + x2 = 0 + 408
53.4x + x2 = 0 + 408

Combine like terms: 0 + 408 = 408
53.4x + x2 = 408

The x term is 53.4x.  Take half its coefficient (26.7).
Square it (712.89) and add it to both sides.

Add '712.89' to each side of the equation.
53.4x + 712.89 + x2 = 408 + 712.89

Reorder the terms:
712.89 + 53.4x + x2 = 408 + 712.89

Combine like terms: 408 + 712.89 = 1120.89
712.89 + 53.4x + x2 = 1120.89

Factor a perfect square on the left side:
(x + 26.7)(x + 26.7) = 1120.89

Calculate the square root of the right side: 33.479695339

Break this problem into two subproblems by setting 
(x + 26.7) equal to 33.479695339 and -33.479695339.

Subproblem 1

x + 26.7 = 33.479695339 Simplifying x + 26.7 = 33.479695339 Reorder the terms: 26.7 + x = 33.479695339 Solving 26.7 + x = 33.479695339 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-26.7' to each side of the equation. 26.7 + -26.7 + x = 33.479695339 + -26.7 Combine like terms: 26.7 + -26.7 = 0.0 0.0 + x = 33.479695339 + -26.7 x = 33.479695339 + -26.7 Combine like terms: 33.479695339 + -26.7 = 6.779695339 x = 6.779695339 Simplifying x = 6.779695339

Subproblem 2

x + 26.7 = -33.479695339 Simplifying x + 26.7 = -33.479695339 Reorder the terms: 26.7 + x = -33.479695339 Solving 26.7 + x = -33.479695339 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-26.7' to each side of the equation. 26.7 + -26.7 + x = -33.479695339 + -26.7 Combine like terms: 26.7 + -26.7 = 0.0 0.0 + x = -33.479695339 + -26.7 x = -33.479695339 + -26.7 Combine like terms: -33.479695339 + -26.7 = -60.179695339 x = -60.179695339 Simplifying x = -60.179695339

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.779695339, -60.179695339}

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