171-8x=108+5x^2

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Solution for 171-8x=108+5x^2 equation:


Simplifying
171 + -8x = 108 + 5x2

Solving
171 + -8x = 108 + 5x2

Solving for variable 'x'.

Reorder the terms:
171 + -108 + -8x + -5x2 = 108 + 5x2 + -108 + -5x2

Combine like terms: 171 + -108 = 63
63 + -8x + -5x2 = 108 + 5x2 + -108 + -5x2

Reorder the terms:
63 + -8x + -5x2 = 108 + -108 + 5x2 + -5x2

Combine like terms: 108 + -108 = 0
63 + -8x + -5x2 = 0 + 5x2 + -5x2
63 + -8x + -5x2 = 5x2 + -5x2

Combine like terms: 5x2 + -5x2 = 0
63 + -8x + -5x2 = 0

Begin completing the square.  Divide all terms by
-5 the coefficient of the squared term: 

Divide each side by '-5'.
-12.6 + 1.6x + x2 = 0

Move the constant term to the right:

Add '12.6' to each side of the equation.
-12.6 + 1.6x + 12.6 + x2 = 0 + 12.6

Reorder the terms:
-12.6 + 12.6 + 1.6x + x2 = 0 + 12.6

Combine like terms: -12.6 + 12.6 = 0.0
0.0 + 1.6x + x2 = 0 + 12.6
1.6x + x2 = 0 + 12.6

Combine like terms: 0 + 12.6 = 12.6
1.6x + x2 = 12.6

The x term is 1.6x.  Take half its coefficient (0.8).
Square it (0.64) and add it to both sides.

Add '0.64' to each side of the equation.
1.6x + 0.64 + x2 = 12.6 + 0.64

Reorder the terms:
0.64 + 1.6x + x2 = 12.6 + 0.64

Combine like terms: 12.6 + 0.64 = 13.24
0.64 + 1.6x + x2 = 13.24

Factor a perfect square on the left side:
(x + 0.8)(x + 0.8) = 13.24

Calculate the square root of the right side: 3.63868108

Break this problem into two subproblems by setting 
(x + 0.8) equal to 3.63868108 and -3.63868108.

Subproblem 1

x + 0.8 = 3.63868108 Simplifying x + 0.8 = 3.63868108 Reorder the terms: 0.8 + x = 3.63868108 Solving 0.8 + x = 3.63868108 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.8' to each side of the equation. 0.8 + -0.8 + x = 3.63868108 + -0.8 Combine like terms: 0.8 + -0.8 = 0.0 0.0 + x = 3.63868108 + -0.8 x = 3.63868108 + -0.8 Combine like terms: 3.63868108 + -0.8 = 2.83868108 x = 2.83868108 Simplifying x = 2.83868108

Subproblem 2

x + 0.8 = -3.63868108 Simplifying x + 0.8 = -3.63868108 Reorder the terms: 0.8 + x = -3.63868108 Solving 0.8 + x = -3.63868108 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.8' to each side of the equation. 0.8 + -0.8 + x = -3.63868108 + -0.8 Combine like terms: 0.8 + -0.8 = 0.0 0.0 + x = -3.63868108 + -0.8 x = -3.63868108 + -0.8 Combine like terms: -3.63868108 + -0.8 = -4.43868108 x = -4.43868108 Simplifying x = -4.43868108

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.83868108, -4.43868108}

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