28x^2-3x-15=0

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Solution for 28x^2-3x-15=0 equation:


Simplifying
28x2 + -3x + -15 = 0

Reorder the terms:
-15 + -3x + 28x2 = 0

Solving
-15 + -3x + 28x2 = 0

Solving for variable 'x'.

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

Divide each side by '28'.
-0.5357142857 + -0.1071428571x + x2 = 0

Move the constant term to the right:

Add '0.5357142857' to each side of the equation.
-0.5357142857 + -0.1071428571x + 0.5357142857 + x2 = 0 + 0.5357142857

Reorder the terms:
-0.5357142857 + 0.5357142857 + -0.1071428571x + x2 = 0 + 0.5357142857

Combine like terms: -0.5357142857 + 0.5357142857 = 0.0000000000
0.0000000000 + -0.1071428571x + x2 = 0 + 0.5357142857
-0.1071428571x + x2 = 0 + 0.5357142857

Combine like terms: 0 + 0.5357142857 = 0.5357142857
-0.1071428571x + x2 = 0.5357142857

The x term is -0.1071428571x.  Take half its coefficient (-0.05357142855).
Square it (0.002869897957) and add it to both sides.

Add '0.002869897957' to each side of the equation.
-0.1071428571x + 0.002869897957 + x2 = 0.5357142857 + 0.002869897957

Reorder the terms:
0.002869897957 + -0.1071428571x + x2 = 0.5357142857 + 0.002869897957

Combine like terms: 0.5357142857 + 0.002869897957 = 0.538584183657
0.002869897957 + -0.1071428571x + x2 = 0.538584183657

Factor a perfect square on the left side:
(x + -0.05357142855)(x + -0.05357142855) = 0.538584183657

Calculate the square root of the right side: 0.73388295

Break this problem into two subproblems by setting 
(x + -0.05357142855) equal to 0.73388295 and -0.73388295.

Subproblem 1

x + -0.05357142855 = 0.73388295 Simplifying x + -0.05357142855 = 0.73388295 Reorder the terms: -0.05357142855 + x = 0.73388295 Solving -0.05357142855 + x = 0.73388295 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.05357142855' to each side of the equation. -0.05357142855 + 0.05357142855 + x = 0.73388295 + 0.05357142855 Combine like terms: -0.05357142855 + 0.05357142855 = 0.00000000000 0.00000000000 + x = 0.73388295 + 0.05357142855 x = 0.73388295 + 0.05357142855 Combine like terms: 0.73388295 + 0.05357142855 = 0.78745437855 x = 0.78745437855 Simplifying x = 0.78745437855

Subproblem 2

x + -0.05357142855 = -0.73388295 Simplifying x + -0.05357142855 = -0.73388295 Reorder the terms: -0.05357142855 + x = -0.73388295 Solving -0.05357142855 + x = -0.73388295 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.05357142855' to each side of the equation. -0.05357142855 + 0.05357142855 + x = -0.73388295 + 0.05357142855 Combine like terms: -0.05357142855 + 0.05357142855 = 0.00000000000 0.00000000000 + x = -0.73388295 + 0.05357142855 x = -0.73388295 + 0.05357142855 Combine like terms: -0.73388295 + 0.05357142855 = -0.68031152145 x = -0.68031152145 Simplifying x = -0.68031152145

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.78745437855, -0.68031152145}

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