28.2x^2+3x-5=0

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Solution for 28.2x^2+3x-5=0 equation:


Simplifying
28.2x2 + 3x + -5 = 0

Reorder the terms:
-5 + 3x + 28.2x2 = 0

Solving
-5 + 3x + 28.2x2 = 0

Solving for variable 'x'.

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

Divide each side by '28.2'.
-0.1773049645 + 0.1063829787x + x2 = 0

Move the constant term to the right:

Add '0.1773049645' to each side of the equation.
-0.1773049645 + 0.1063829787x + 0.1773049645 + x2 = 0 + 0.1773049645

Reorder the terms:
-0.1773049645 + 0.1773049645 + 0.1063829787x + x2 = 0 + 0.1773049645

Combine like terms: -0.1773049645 + 0.1773049645 = 0.0000000000
0.0000000000 + 0.1063829787x + x2 = 0 + 0.1773049645
0.1063829787x + x2 = 0 + 0.1773049645

Combine like terms: 0 + 0.1773049645 = 0.1773049645
0.1063829787x + x2 = 0.1773049645

The x term is 0.1063829787x.  Take half its coefficient (0.05319148935).
Square it (0.002829334539) and add it to both sides.

Add '0.002829334539' to each side of the equation.
0.1063829787x + 0.002829334539 + x2 = 0.1773049645 + 0.002829334539

Reorder the terms:
0.002829334539 + 0.1063829787x + x2 = 0.1773049645 + 0.002829334539

Combine like terms: 0.1773049645 + 0.002829334539 = 0.180134299039
0.002829334539 + 0.1063829787x + x2 = 0.180134299039

Factor a perfect square on the left side:
(x + 0.05319148935)(x + 0.05319148935) = 0.180134299039

Calculate the square root of the right side: 0.424422312

Break this problem into two subproblems by setting 
(x + 0.05319148935) equal to 0.424422312 and -0.424422312.

Subproblem 1

x + 0.05319148935 = 0.424422312 Simplifying x + 0.05319148935 = 0.424422312 Reorder the terms: 0.05319148935 + x = 0.424422312 Solving 0.05319148935 + x = 0.424422312 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.05319148935' to each side of the equation. 0.05319148935 + -0.05319148935 + x = 0.424422312 + -0.05319148935 Combine like terms: 0.05319148935 + -0.05319148935 = 0.00000000000 0.00000000000 + x = 0.424422312 + -0.05319148935 x = 0.424422312 + -0.05319148935 Combine like terms: 0.424422312 + -0.05319148935 = 0.37123082265 x = 0.37123082265 Simplifying x = 0.37123082265

Subproblem 2

x + 0.05319148935 = -0.424422312 Simplifying x + 0.05319148935 = -0.424422312 Reorder the terms: 0.05319148935 + x = -0.424422312 Solving 0.05319148935 + x = -0.424422312 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.05319148935' to each side of the equation. 0.05319148935 + -0.05319148935 + x = -0.424422312 + -0.05319148935 Combine like terms: 0.05319148935 + -0.05319148935 = 0.00000000000 0.00000000000 + x = -0.424422312 + -0.05319148935 x = -0.424422312 + -0.05319148935 Combine like terms: -0.424422312 + -0.05319148935 = -0.47761380135 x = -0.47761380135 Simplifying x = -0.47761380135

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.37123082265, -0.47761380135}

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