4x^2-23x-28=0

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Solution for 4x^2-23x-28=0 equation:


Simplifying
4x2 + -23x + -28 = 0

Reorder the terms:
-28 + -23x + 4x2 = 0

Solving
-28 + -23x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
-7 + -5.75x + x2 = 0

Move the constant term to the right:

Add '7' to each side of the equation.
-7 + -5.75x + 7 + x2 = 0 + 7

Reorder the terms:
-7 + 7 + -5.75x + x2 = 0 + 7

Combine like terms: -7 + 7 = 0
0 + -5.75x + x2 = 0 + 7
-5.75x + x2 = 0 + 7

Combine like terms: 0 + 7 = 7
-5.75x + x2 = 7

The x term is -5.75x.  Take half its coefficient (-2.875).
Square it (8.265625) and add it to both sides.

Add '8.265625' to each side of the equation.
-5.75x + 8.265625 + x2 = 7 + 8.265625

Reorder the terms:
8.265625 + -5.75x + x2 = 7 + 8.265625

Combine like terms: 7 + 8.265625 = 15.265625
8.265625 + -5.75x + x2 = 15.265625

Factor a perfect square on the left side:
(x + -2.875)(x + -2.875) = 15.265625

Calculate the square root of the right side: 3.907124902

Break this problem into two subproblems by setting 
(x + -2.875) equal to 3.907124902 and -3.907124902.

Subproblem 1

x + -2.875 = 3.907124902 Simplifying x + -2.875 = 3.907124902 Reorder the terms: -2.875 + x = 3.907124902 Solving -2.875 + x = 3.907124902 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.875' to each side of the equation. -2.875 + 2.875 + x = 3.907124902 + 2.875 Combine like terms: -2.875 + 2.875 = 0.000 0.000 + x = 3.907124902 + 2.875 x = 3.907124902 + 2.875 Combine like terms: 3.907124902 + 2.875 = 6.782124902 x = 6.782124902 Simplifying x = 6.782124902

Subproblem 2

x + -2.875 = -3.907124902 Simplifying x + -2.875 = -3.907124902 Reorder the terms: -2.875 + x = -3.907124902 Solving -2.875 + x = -3.907124902 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.875' to each side of the equation. -2.875 + 2.875 + x = -3.907124902 + 2.875 Combine like terms: -2.875 + 2.875 = 0.000 0.000 + x = -3.907124902 + 2.875 x = -3.907124902 + 2.875 Combine like terms: -3.907124902 + 2.875 = -1.032124902 x = -1.032124902 Simplifying x = -1.032124902

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.782124902, -1.032124902}

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