5*x^2-5*0.707*x-.2=0

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Solution for 5*x^2-5*0.707*x-.2=0 equation:


Simplifying
5x2 + -5 * 0.707x + -0.2 = 0

Multiply -5 * 0.707
5x2 + -3.535x + -0.2 = 0

Reorder the terms:
-0.2 + -3.535x + 5x2 = 0

Solving
-0.2 + -3.535x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
-0.04 + -0.707x + x2 = 0

Move the constant term to the right:

Add '0.04' to each side of the equation.
-0.04 + -0.707x + 0.04 + x2 = 0 + 0.04

Reorder the terms:
-0.04 + 0.04 + -0.707x + x2 = 0 + 0.04

Combine like terms: -0.04 + 0.04 = 0.00
0.00 + -0.707x + x2 = 0 + 0.04
-0.707x + x2 = 0 + 0.04

Combine like terms: 0 + 0.04 = 0.04
-0.707x + x2 = 0.04

The x term is -0.707x.  Take half its coefficient (-0.3535).
Square it (0.12496225) and add it to both sides.

Add '0.12496225' to each side of the equation.
-0.707x + 0.12496225 + x2 = 0.04 + 0.12496225

Reorder the terms:
0.12496225 + -0.707x + x2 = 0.04 + 0.12496225

Combine like terms: 0.04 + 0.12496225 = 0.16496225
0.12496225 + -0.707x + x2 = 0.16496225

Factor a perfect square on the left side:
(x + -0.3535)(x + -0.3535) = 0.16496225

Calculate the square root of the right side: 0.406155451

Break this problem into two subproblems by setting 
(x + -0.3535) equal to 0.406155451 and -0.406155451.

Subproblem 1

x + -0.3535 = 0.406155451 Simplifying x + -0.3535 = 0.406155451 Reorder the terms: -0.3535 + x = 0.406155451 Solving -0.3535 + x = 0.406155451 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3535' to each side of the equation. -0.3535 + 0.3535 + x = 0.406155451 + 0.3535 Combine like terms: -0.3535 + 0.3535 = 0.0000 0.0000 + x = 0.406155451 + 0.3535 x = 0.406155451 + 0.3535 Combine like terms: 0.406155451 + 0.3535 = 0.759655451 x = 0.759655451 Simplifying x = 0.759655451

Subproblem 2

x + -0.3535 = -0.406155451 Simplifying x + -0.3535 = -0.406155451 Reorder the terms: -0.3535 + x = -0.406155451 Solving -0.3535 + x = -0.406155451 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3535' to each side of the equation. -0.3535 + 0.3535 + x = -0.406155451 + 0.3535 Combine like terms: -0.3535 + 0.3535 = 0.0000 0.0000 + x = -0.406155451 + 0.3535 x = -0.406155451 + 0.3535 Combine like terms: -0.406155451 + 0.3535 = -0.052655451 x = -0.052655451 Simplifying x = -0.052655451

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.759655451, -0.052655451}

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