x=0.1x^2+8x-50

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Solution for x=0.1x^2+8x-50 equation:


Simplifying
x = 0.1x2 + 8x + -50

Reorder the terms:
x = -50 + 8x + 0.1x2

Solving
x = -50 + 8x + 0.1x2

Solving for variable 'x'.

Reorder the terms:
50 + x + -8x + -0.1x2 = -50 + 8x + 0.1x2 + 50 + -8x + -0.1x2

Combine like terms: x + -8x = -7x
50 + -7x + -0.1x2 = -50 + 8x + 0.1x2 + 50 + -8x + -0.1x2

Reorder the terms:
50 + -7x + -0.1x2 = -50 + 50 + 8x + -8x + 0.1x2 + -0.1x2

Combine like terms: -50 + 50 = 0
50 + -7x + -0.1x2 = 0 + 8x + -8x + 0.1x2 + -0.1x2
50 + -7x + -0.1x2 = 8x + -8x + 0.1x2 + -0.1x2

Combine like terms: 8x + -8x = 0
50 + -7x + -0.1x2 = 0 + 0.1x2 + -0.1x2
50 + -7x + -0.1x2 = 0.1x2 + -0.1x2

Combine like terms: 0.1x2 + -0.1x2 = 0.0
50 + -7x + -0.1x2 = 0.0

Begin completing the square.  Divide all terms by
-0.1 the coefficient of the squared term: 

Divide each side by '-0.1'.
-500 + 70x + x2 = 0

Move the constant term to the right:

Add '500' to each side of the equation.
-500 + 70x + 500 + x2 = 0 + 500

Reorder the terms:
-500 + 500 + 70x + x2 = 0 + 500

Combine like terms: -500 + 500 = 0
0 + 70x + x2 = 0 + 500
70x + x2 = 0 + 500

Combine like terms: 0 + 500 = 500
70x + x2 = 500

The x term is 70x.  Take half its coefficient (35).
Square it (1225) and add it to both sides.

Add '1225' to each side of the equation.
70x + 1225 + x2 = 500 + 1225

Reorder the terms:
1225 + 70x + x2 = 500 + 1225

Combine like terms: 500 + 1225 = 1725
1225 + 70x + x2 = 1725

Factor a perfect square on the left side:
(x + 35)(x + 35) = 1725

Calculate the square root of the right side: 41.533119315

Break this problem into two subproblems by setting 
(x + 35) equal to 41.533119315 and -41.533119315.

Subproblem 1

x + 35 = 41.533119315 Simplifying x + 35 = 41.533119315 Reorder the terms: 35 + x = 41.533119315 Solving 35 + x = 41.533119315 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-35' to each side of the equation. 35 + -35 + x = 41.533119315 + -35 Combine like terms: 35 + -35 = 0 0 + x = 41.533119315 + -35 x = 41.533119315 + -35 Combine like terms: 41.533119315 + -35 = 6.533119315 x = 6.533119315 Simplifying x = 6.533119315

Subproblem 2

x + 35 = -41.533119315 Simplifying x + 35 = -41.533119315 Reorder the terms: 35 + x = -41.533119315 Solving 35 + x = -41.533119315 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-35' to each side of the equation. 35 + -35 + x = -41.533119315 + -35 Combine like terms: 35 + -35 = 0 0 + x = -41.533119315 + -35 x = -41.533119315 + -35 Combine like terms: -41.533119315 + -35 = -76.533119315 x = -76.533119315 Simplifying x = -76.533119315

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.533119315, -76.533119315}

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