4x^2-8x-84=8

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Solution for 4x^2-8x-84=8 equation:


Simplifying
4x2 + -8x + -84 = 8

Reorder the terms:
-84 + -8x + 4x2 = 8

Solving
-84 + -8x + 4x2 = 8

Solving for variable 'x'.

Reorder the terms:
-84 + -8 + -8x + 4x2 = 8 + -8

Combine like terms: -84 + -8 = -92
-92 + -8x + 4x2 = 8 + -8

Combine like terms: 8 + -8 = 0
-92 + -8x + 4x2 = 0

Factor out the Greatest Common Factor (GCF), '4'.
4(-23 + -2x + x2) = 0

Ignore the factor 4.

Subproblem 1

Set the factor '(-23 + -2x + x2)' equal to zero and attempt to solve: Simplifying -23 + -2x + x2 = 0 Solving -23 + -2x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '23' to each side of the equation. -23 + -2x + 23 + x2 = 0 + 23 Reorder the terms: -23 + 23 + -2x + x2 = 0 + 23 Combine like terms: -23 + 23 = 0 0 + -2x + x2 = 0 + 23 -2x + x2 = 0 + 23 Combine like terms: 0 + 23 = 23 -2x + x2 = 23 The x term is -2x. Take half its coefficient (-1). Square it (1) and add it to both sides. Add '1' to each side of the equation. -2x + 1 + x2 = 23 + 1 Reorder the terms: 1 + -2x + x2 = 23 + 1 Combine like terms: 23 + 1 = 24 1 + -2x + x2 = 24 Factor a perfect square on the left side: (x + -1)(x + -1) = 24 Calculate the square root of the right side: 4.898979486 Break this problem into two subproblems by setting (x + -1) equal to 4.898979486 and -4.898979486.

Subproblem 1

x + -1 = 4.898979486 Simplifying x + -1 = 4.898979486 Reorder the terms: -1 + x = 4.898979486 Solving -1 + x = 4.898979486 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = 4.898979486 + 1 Combine like terms: -1 + 1 = 0 0 + x = 4.898979486 + 1 x = 4.898979486 + 1 Combine like terms: 4.898979486 + 1 = 5.898979486 x = 5.898979486 Simplifying x = 5.898979486

Subproblem 2

x + -1 = -4.898979486 Simplifying x + -1 = -4.898979486 Reorder the terms: -1 + x = -4.898979486 Solving -1 + x = -4.898979486 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = -4.898979486 + 1 Combine like terms: -1 + 1 = 0 0 + x = -4.898979486 + 1 x = -4.898979486 + 1 Combine like terms: -4.898979486 + 1 = -3.898979486 x = -3.898979486 Simplifying x = -3.898979486

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.898979486, -3.898979486}

Solution

x = {5.898979486, -3.898979486}

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