4x^2-5x-385=0

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Solution for 4x^2-5x-385=0 equation:


Simplifying
4x2 + -5x + -385 = 0

Reorder the terms:
-385 + -5x + 4x2 = 0

Solving
-385 + -5x + 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'.
-96.25 + -1.25x + x2 = 0

Move the constant term to the right:

Add '96.25' to each side of the equation.
-96.25 + -1.25x + 96.25 + x2 = 0 + 96.25

Reorder the terms:
-96.25 + 96.25 + -1.25x + x2 = 0 + 96.25

Combine like terms: -96.25 + 96.25 = 0.00
0.00 + -1.25x + x2 = 0 + 96.25
-1.25x + x2 = 0 + 96.25

Combine like terms: 0 + 96.25 = 96.25
-1.25x + x2 = 96.25

The x term is -1.25x.  Take half its coefficient (-0.625).
Square it (0.390625) and add it to both sides.

Add '0.390625' to each side of the equation.
-1.25x + 0.390625 + x2 = 96.25 + 0.390625

Reorder the terms:
0.390625 + -1.25x + x2 = 96.25 + 0.390625

Combine like terms: 96.25 + 0.390625 = 96.640625
0.390625 + -1.25x + x2 = 96.640625

Factor a perfect square on the left side:
(x + -0.625)(x + -0.625) = 96.640625

Calculate the square root of the right side: 9.830596371

Break this problem into two subproblems by setting 
(x + -0.625) equal to 9.830596371 and -9.830596371.

Subproblem 1

x + -0.625 = 9.830596371 Simplifying x + -0.625 = 9.830596371 Reorder the terms: -0.625 + x = 9.830596371 Solving -0.625 + x = 9.830596371 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + x = 9.830596371 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + x = 9.830596371 + 0.625 x = 9.830596371 + 0.625 Combine like terms: 9.830596371 + 0.625 = 10.455596371 x = 10.455596371 Simplifying x = 10.455596371

Subproblem 2

x + -0.625 = -9.830596371 Simplifying x + -0.625 = -9.830596371 Reorder the terms: -0.625 + x = -9.830596371 Solving -0.625 + x = -9.830596371 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + x = -9.830596371 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + x = -9.830596371 + 0.625 x = -9.830596371 + 0.625 Combine like terms: -9.830596371 + 0.625 = -9.205596371 x = -9.205596371 Simplifying x = -9.205596371

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.455596371, -9.205596371}

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