7x^2-14x-88=-5

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Solution for 7x^2-14x-88=-5 equation:


Simplifying
7x2 + -14x + -88 = -5

Reorder the terms:
-88 + -14x + 7x2 = -5

Solving
-88 + -14x + 7x2 = -5

Solving for variable 'x'.

Reorder the terms:
-88 + 5 + -14x + 7x2 = -5 + 5

Combine like terms: -88 + 5 = -83
-83 + -14x + 7x2 = -5 + 5

Combine like terms: -5 + 5 = 0
-83 + -14x + 7x2 = 0

Begin completing the square.  Divide all terms by
7 the coefficient of the squared term: 

Divide each side by '7'.
-11.85714286 + -2x + x2 = 0

Move the constant term to the right:

Add '11.85714286' to each side of the equation.
-11.85714286 + -2x + 11.85714286 + x2 = 0 + 11.85714286

Reorder the terms:
-11.85714286 + 11.85714286 + -2x + x2 = 0 + 11.85714286

Combine like terms: -11.85714286 + 11.85714286 = 0.00000000
0.00000000 + -2x + x2 = 0 + 11.85714286
-2x + x2 = 0 + 11.85714286

Combine like terms: 0 + 11.85714286 = 11.85714286
-2x + x2 = 11.85714286

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 = 11.85714286 + 1

Reorder the terms:
1 + -2x + x2 = 11.85714286 + 1

Combine like terms: 11.85714286 + 1 = 12.85714286
1 + -2x + x2 = 12.85714286

Factor a perfect square on the left side:
(x + -1)(x + -1) = 12.85714286

Calculate the square root of the right side: 3.585685828

Break this problem into two subproblems by setting 
(x + -1) equal to 3.585685828 and -3.585685828.

Subproblem 1

x + -1 = 3.585685828 Simplifying x + -1 = 3.585685828 Reorder the terms: -1 + x = 3.585685828 Solving -1 + x = 3.585685828 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 = 3.585685828 + 1 Combine like terms: -1 + 1 = 0 0 + x = 3.585685828 + 1 x = 3.585685828 + 1 Combine like terms: 3.585685828 + 1 = 4.585685828 x = 4.585685828 Simplifying x = 4.585685828

Subproblem 2

x + -1 = -3.585685828 Simplifying x + -1 = -3.585685828 Reorder the terms: -1 + x = -3.585685828 Solving -1 + x = -3.585685828 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 = -3.585685828 + 1 Combine like terms: -1 + 1 = 0 0 + x = -3.585685828 + 1 x = -3.585685828 + 1 Combine like terms: -3.585685828 + 1 = -2.585685828 x = -2.585685828 Simplifying x = -2.585685828

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.585685828, -2.585685828}

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