0.1x^2+2x-16=0

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Solution for 0.1x^2+2x-16=0 equation:


Simplifying
0.1x2 + 2x + -16 = 0

Reorder the terms:
-16 + 2x + 0.1x2 = 0

Solving
-16 + 2x + 0.1x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.1'.
-160 + 20x + x2 = 0

Move the constant term to the right:

Add '160' to each side of the equation.
-160 + 20x + 160 + x2 = 0 + 160

Reorder the terms:
-160 + 160 + 20x + x2 = 0 + 160

Combine like terms: -160 + 160 = 0
0 + 20x + x2 = 0 + 160
20x + x2 = 0 + 160

Combine like terms: 0 + 160 = 160
20x + x2 = 160

The x term is 20x.  Take half its coefficient (10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
20x + 100 + x2 = 160 + 100

Reorder the terms:
100 + 20x + x2 = 160 + 100

Combine like terms: 160 + 100 = 260
100 + 20x + x2 = 260

Factor a perfect square on the left side:
(x + 10)(x + 10) = 260

Calculate the square root of the right side: 16.124515497

Break this problem into two subproblems by setting 
(x + 10) equal to 16.124515497 and -16.124515497.

Subproblem 1

x + 10 = 16.124515497 Simplifying x + 10 = 16.124515497 Reorder the terms: 10 + x = 16.124515497 Solving 10 + x = 16.124515497 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + x = 16.124515497 + -10 Combine like terms: 10 + -10 = 0 0 + x = 16.124515497 + -10 x = 16.124515497 + -10 Combine like terms: 16.124515497 + -10 = 6.124515497 x = 6.124515497 Simplifying x = 6.124515497

Subproblem 2

x + 10 = -16.124515497 Simplifying x + 10 = -16.124515497 Reorder the terms: 10 + x = -16.124515497 Solving 10 + x = -16.124515497 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + x = -16.124515497 + -10 Combine like terms: 10 + -10 = 0 0 + x = -16.124515497 + -10 x = -16.124515497 + -10 Combine like terms: -16.124515497 + -10 = -26.124515497 x = -26.124515497 Simplifying x = -26.124515497

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.124515497, -26.124515497}

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