5x^2-10x-3.14=0

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Solution for 5x^2-10x-3.14=0 equation:


Simplifying
5x2 + -10x + -3.14 = 0

Reorder the terms:
-3.14 + -10x + 5x2 = 0

Solving
-3.14 + -10x + 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'.
-0.628 + -2x + x2 = 0

Move the constant term to the right:

Add '0.628' to each side of the equation.
-0.628 + -2x + 0.628 + x2 = 0 + 0.628

Reorder the terms:
-0.628 + 0.628 + -2x + x2 = 0 + 0.628

Combine like terms: -0.628 + 0.628 = 0.000
0.000 + -2x + x2 = 0 + 0.628
-2x + x2 = 0 + 0.628

Combine like terms: 0 + 0.628 = 0.628
-2x + x2 = 0.628

The x term is -2x.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2x + 1 + x2 = 0.628 + 1

Reorder the terms:
1 + -2x + x2 = 0.628 + 1

Combine like terms: 0.628 + 1 = 1.628
1 + -2x + x2 = 1.628

Factor a perfect square on the left side:
(x + -1)(x + -1) = 1.628

Calculate the square root of the right side: 1.275931033

Break this problem into two subproblems by setting 
(x + -1) equal to 1.275931033 and -1.275931033.

Subproblem 1

x + -1 = 1.275931033 Simplifying x + -1 = 1.275931033 Reorder the terms: -1 + x = 1.275931033 Solving -1 + x = 1.275931033 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = 1.275931033 + 1 Combine like terms: -1 + 1 = 0 0 + x = 1.275931033 + 1 x = 1.275931033 + 1 Combine like terms: 1.275931033 + 1 = 2.275931033 x = 2.275931033 Simplifying x = 2.275931033

Subproblem 2

x + -1 = -1.275931033 Simplifying x + -1 = -1.275931033 Reorder the terms: -1 + x = -1.275931033 Solving -1 + x = -1.275931033 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = -1.275931033 + 1 Combine like terms: -1 + 1 = 0 0 + x = -1.275931033 + 1 x = -1.275931033 + 1 Combine like terms: -1.275931033 + 1 = -0.275931033 x = -0.275931033 Simplifying x = -0.275931033

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.275931033, -0.275931033}

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