4x^2-56x-45=0

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Solution for 4x^2-56x-45=0 equation:


Simplifying
4x2 + -56x + -45 = 0

Reorder the terms:
-45 + -56x + 4x2 = 0

Solving
-45 + -56x + 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'.
-11.25 + -14x + x2 = 0

Move the constant term to the right:

Add '11.25' to each side of the equation.
-11.25 + -14x + 11.25 + x2 = 0 + 11.25

Reorder the terms:
-11.25 + 11.25 + -14x + x2 = 0 + 11.25

Combine like terms: -11.25 + 11.25 = 0.00
0.00 + -14x + x2 = 0 + 11.25
-14x + x2 = 0 + 11.25

Combine like terms: 0 + 11.25 = 11.25
-14x + x2 = 11.25

The x term is -14x.  Take half its coefficient (-7).
Square it (49) and add it to both sides.

Add '49' to each side of the equation.
-14x + 49 + x2 = 11.25 + 49

Reorder the terms:
49 + -14x + x2 = 11.25 + 49

Combine like terms: 11.25 + 49 = 60.25
49 + -14x + x2 = 60.25

Factor a perfect square on the left side:
(x + -7)(x + -7) = 60.25

Calculate the square root of the right side: 7.762087348

Break this problem into two subproblems by setting 
(x + -7) equal to 7.762087348 and -7.762087348.

Subproblem 1

x + -7 = 7.762087348 Simplifying x + -7 = 7.762087348 Reorder the terms: -7 + x = 7.762087348 Solving -7 + x = 7.762087348 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + x = 7.762087348 + 7 Combine like terms: -7 + 7 = 0 0 + x = 7.762087348 + 7 x = 7.762087348 + 7 Combine like terms: 7.762087348 + 7 = 14.762087348 x = 14.762087348 Simplifying x = 14.762087348

Subproblem 2

x + -7 = -7.762087348 Simplifying x + -7 = -7.762087348 Reorder the terms: -7 + x = -7.762087348 Solving -7 + x = -7.762087348 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + x = -7.762087348 + 7 Combine like terms: -7 + 7 = 0 0 + x = -7.762087348 + 7 x = -7.762087348 + 7 Combine like terms: -7.762087348 + 7 = -0.762087348 x = -0.762087348 Simplifying x = -0.762087348

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14.762087348, -0.762087348}

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