45x^2-28x-5=0

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Solution for 45x^2-28x-5=0 equation:


Simplifying
45x2 + -28x + -5 = 0

Reorder the terms:
-5 + -28x + 45x2 = 0

Solving
-5 + -28x + 45x2 = 0

Solving for variable 'x'.

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

Divide each side by '45'.
-0.1111111111 + -0.6222222222x + x2 = 0

Move the constant term to the right:

Add '0.1111111111' to each side of the equation.
-0.1111111111 + -0.6222222222x + 0.1111111111 + x2 = 0 + 0.1111111111

Reorder the terms:
-0.1111111111 + 0.1111111111 + -0.6222222222x + x2 = 0 + 0.1111111111

Combine like terms: -0.1111111111 + 0.1111111111 = 0.0000000000
0.0000000000 + -0.6222222222x + x2 = 0 + 0.1111111111
-0.6222222222x + x2 = 0 + 0.1111111111

Combine like terms: 0 + 0.1111111111 = 0.1111111111
-0.6222222222x + x2 = 0.1111111111

The x term is -0.6222222222x.  Take half its coefficient (-0.3111111111).
Square it (0.09679012345) and add it to both sides.

Add '0.09679012345' to each side of the equation.
-0.6222222222x + 0.09679012345 + x2 = 0.1111111111 + 0.09679012345

Reorder the terms:
0.09679012345 + -0.6222222222x + x2 = 0.1111111111 + 0.09679012345

Combine like terms: 0.1111111111 + 0.09679012345 = 0.20790123455
0.09679012345 + -0.6222222222x + x2 = 0.20790123455

Factor a perfect square on the left side:
(x + -0.3111111111)(x + -0.3111111111) = 0.20790123455

Calculate the square root of the right side: 0.455961878

Break this problem into two subproblems by setting 
(x + -0.3111111111) equal to 0.455961878 and -0.455961878.

Subproblem 1

x + -0.3111111111 = 0.455961878 Simplifying x + -0.3111111111 = 0.455961878 Reorder the terms: -0.3111111111 + x = 0.455961878 Solving -0.3111111111 + x = 0.455961878 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3111111111' to each side of the equation. -0.3111111111 + 0.3111111111 + x = 0.455961878 + 0.3111111111 Combine like terms: -0.3111111111 + 0.3111111111 = 0.0000000000 0.0000000000 + x = 0.455961878 + 0.3111111111 x = 0.455961878 + 0.3111111111 Combine like terms: 0.455961878 + 0.3111111111 = 0.7670729891 x = 0.7670729891 Simplifying x = 0.7670729891

Subproblem 2

x + -0.3111111111 = -0.455961878 Simplifying x + -0.3111111111 = -0.455961878 Reorder the terms: -0.3111111111 + x = -0.455961878 Solving -0.3111111111 + x = -0.455961878 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3111111111' to each side of the equation. -0.3111111111 + 0.3111111111 + x = -0.455961878 + 0.3111111111 Combine like terms: -0.3111111111 + 0.3111111111 = 0.0000000000 0.0000000000 + x = -0.455961878 + 0.3111111111 x = -0.455961878 + 0.3111111111 Combine like terms: -0.455961878 + 0.3111111111 = -0.1448507669 x = -0.1448507669 Simplifying x = -0.1448507669

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.7670729891, -0.1448507669}

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