4x^2-16x-56=0

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Solution for 4x^2-16x-56=0 equation:


Simplifying
4x2 + -16x + -56 = 0

Reorder the terms:
-56 + -16x + 4x2 = 0

Solving
-56 + -16x + 4x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '4'.
4(-14 + -4x + x2) = 0

Ignore the factor 4.

Subproblem 1

Set the factor '(-14 + -4x + x2)' equal to zero and attempt to solve: Simplifying -14 + -4x + x2 = 0 Solving -14 + -4x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '14' to each side of the equation. -14 + -4x + 14 + x2 = 0 + 14 Reorder the terms: -14 + 14 + -4x + x2 = 0 + 14 Combine like terms: -14 + 14 = 0 0 + -4x + x2 = 0 + 14 -4x + x2 = 0 + 14 Combine like terms: 0 + 14 = 14 -4x + x2 = 14 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 = 14 + 4 Reorder the terms: 4 + -4x + x2 = 14 + 4 Combine like terms: 14 + 4 = 18 4 + -4x + x2 = 18 Factor a perfect square on the left side: (x + -2)(x + -2) = 18 Calculate the square root of the right side: 4.242640687 Break this problem into two subproblems by setting (x + -2) equal to 4.242640687 and -4.242640687.

Subproblem 1

x + -2 = 4.242640687 Simplifying x + -2 = 4.242640687 Reorder the terms: -2 + x = 4.242640687 Solving -2 + x = 4.242640687 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 = 4.242640687 + 2 Combine like terms: -2 + 2 = 0 0 + x = 4.242640687 + 2 x = 4.242640687 + 2 Combine like terms: 4.242640687 + 2 = 6.242640687 x = 6.242640687 Simplifying x = 6.242640687

Subproblem 2

x + -2 = -4.242640687 Simplifying x + -2 = -4.242640687 Reorder the terms: -2 + x = -4.242640687 Solving -2 + x = -4.242640687 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 = -4.242640687 + 2 Combine like terms: -2 + 2 = 0 0 + x = -4.242640687 + 2 x = -4.242640687 + 2 Combine like terms: -4.242640687 + 2 = -2.242640687 x = -2.242640687 Simplifying x = -2.242640687

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.242640687, -2.242640687}

Solution

x = {6.242640687, -2.242640687}

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