x^2-4x-56=3

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Solution for x^2-4x-56=3 equation:


Simplifying
x2 + -4x + -56 = 3

Reorder the terms:
-56 + -4x + x2 = 3

Solving
-56 + -4x + x2 = 3

Solving for variable 'x'.

Reorder the terms:
-56 + -3 + -4x + x2 = 3 + -3

Combine like terms: -56 + -3 = -59
-59 + -4x + x2 = 3 + -3

Combine like terms: 3 + -3 = 0
-59 + -4x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '59' to each side of the equation.
-59 + -4x + 59 + x2 = 0 + 59

Reorder the terms:
-59 + 59 + -4x + x2 = 0 + 59

Combine like terms: -59 + 59 = 0
0 + -4x + x2 = 0 + 59
-4x + x2 = 0 + 59

Combine like terms: 0 + 59 = 59
-4x + x2 = 59

The x term is -4x.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4x + 4 + x2 = 59 + 4

Reorder the terms:
4 + -4x + x2 = 59 + 4

Combine like terms: 59 + 4 = 63
4 + -4x + x2 = 63

Factor a perfect square on the left side:
(x + -2)(x + -2) = 63

Calculate the square root of the right side: 7.937253933

Break this problem into two subproblems by setting 
(x + -2) equal to 7.937253933 and -7.937253933.

Subproblem 1

x + -2 = 7.937253933 Simplifying x + -2 = 7.937253933 Reorder the terms: -2 + x = 7.937253933 Solving -2 + x = 7.937253933 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = 7.937253933 + 2 Combine like terms: -2 + 2 = 0 0 + x = 7.937253933 + 2 x = 7.937253933 + 2 Combine like terms: 7.937253933 + 2 = 9.937253933 x = 9.937253933 Simplifying x = 9.937253933

Subproblem 2

x + -2 = -7.937253933 Simplifying x + -2 = -7.937253933 Reorder the terms: -2 + x = -7.937253933 Solving -2 + x = -7.937253933 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = -7.937253933 + 2 Combine like terms: -2 + 2 = 0 0 + x = -7.937253933 + 2 x = -7.937253933 + 2 Combine like terms: -7.937253933 + 2 = -5.937253933 x = -5.937253933 Simplifying x = -5.937253933

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.937253933, -5.937253933}

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