0.1x=-0.2x^2+10x+5

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Solution for 0.1x=-0.2x^2+10x+5 equation:


Simplifying
0.1x = -0.2x2 + 10x + 5

Reorder the terms:
0.1x = 5 + 10x + -0.2x2

Solving
0.1x = 5 + 10x + -0.2x2

Solving for variable 'x'.

Reorder the terms:
-5 + 0.1x + -10x + 0.2x2 = 5 + 10x + -0.2x2 + -5 + -10x + 0.2x2

Combine like terms: 0.1x + -10x = -9.9x
-5 + -9.9x + 0.2x2 = 5 + 10x + -0.2x2 + -5 + -10x + 0.2x2

Reorder the terms:
-5 + -9.9x + 0.2x2 = 5 + -5 + 10x + -10x + -0.2x2 + 0.2x2

Combine like terms: 5 + -5 = 0
-5 + -9.9x + 0.2x2 = 0 + 10x + -10x + -0.2x2 + 0.2x2
-5 + -9.9x + 0.2x2 = 10x + -10x + -0.2x2 + 0.2x2

Combine like terms: 10x + -10x = 0
-5 + -9.9x + 0.2x2 = 0 + -0.2x2 + 0.2x2
-5 + -9.9x + 0.2x2 = -0.2x2 + 0.2x2

Combine like terms: -0.2x2 + 0.2x2 = 0.0
-5 + -9.9x + 0.2x2 = 0.0

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

Divide each side by '0.2'.
-25 + -49.5x + x2 = 0

Move the constant term to the right:

Add '25' to each side of the equation.
-25 + -49.5x + 25 + x2 = 0 + 25

Reorder the terms:
-25 + 25 + -49.5x + x2 = 0 + 25

Combine like terms: -25 + 25 = 0
0 + -49.5x + x2 = 0 + 25
-49.5x + x2 = 0 + 25

Combine like terms: 0 + 25 = 25
-49.5x + x2 = 25

The x term is -49.5x.  Take half its coefficient (-24.75).
Square it (612.5625) and add it to both sides.

Add '612.5625' to each side of the equation.
-49.5x + 612.5625 + x2 = 25 + 612.5625

Reorder the terms:
612.5625 + -49.5x + x2 = 25 + 612.5625

Combine like terms: 25 + 612.5625 = 637.5625
612.5625 + -49.5x + x2 = 637.5625

Factor a perfect square on the left side:
(x + -24.75)(x + -24.75) = 637.5625

Calculate the square root of the right side: 25.25

Break this problem into two subproblems by setting 
(x + -24.75) equal to 25.25 and -25.25.

Subproblem 1

x + -24.75 = 25.25 Simplifying x + -24.75 = 25.25 Reorder the terms: -24.75 + x = 25.25 Solving -24.75 + x = 25.25 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '24.75' to each side of the equation. -24.75 + 24.75 + x = 25.25 + 24.75 Combine like terms: -24.75 + 24.75 = 0.00 0.00 + x = 25.25 + 24.75 x = 25.25 + 24.75 Combine like terms: 25.25 + 24.75 = 50 x = 50 Simplifying x = 50

Subproblem 2

x + -24.75 = -25.25 Simplifying x + -24.75 = -25.25 Reorder the terms: -24.75 + x = -25.25 Solving -24.75 + x = -25.25 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '24.75' to each side of the equation. -24.75 + 24.75 + x = -25.25 + 24.75 Combine like terms: -24.75 + 24.75 = 0.00 0.00 + x = -25.25 + 24.75 x = -25.25 + 24.75 Combine like terms: -25.25 + 24.75 = -0.5 x = -0.5 Simplifying x = -0.5

Solution

The solution to the problem is based on the solutions from the subproblems. x = {50, -0.5}

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