5x^2-20x-26=-8

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Solution for 5x^2-20x-26=-8 equation:


Simplifying
5x2 + -20x + -26 = -8

Reorder the terms:
-26 + -20x + 5x2 = -8

Solving
-26 + -20x + 5x2 = -8

Solving for variable 'x'.

Reorder the terms:
-26 + 8 + -20x + 5x2 = -8 + 8

Combine like terms: -26 + 8 = -18
-18 + -20x + 5x2 = -8 + 8

Combine like terms: -8 + 8 = 0
-18 + -20x + 5x2 = 0

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

Divide each side by '5'.
-3.6 + -4x + x2 = 0

Move the constant term to the right:

Add '3.6' to each side of the equation.
-3.6 + -4x + 3.6 + x2 = 0 + 3.6

Reorder the terms:
-3.6 + 3.6 + -4x + x2 = 0 + 3.6

Combine like terms: -3.6 + 3.6 = 0.0
0.0 + -4x + x2 = 0 + 3.6
-4x + x2 = 0 + 3.6

Combine like terms: 0 + 3.6 = 3.6
-4x + x2 = 3.6

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 = 3.6 + 4

Reorder the terms:
4 + -4x + x2 = 3.6 + 4

Combine like terms: 3.6 + 4 = 7.6
4 + -4x + x2 = 7.6

Factor a perfect square on the left side:
(x + -2)(x + -2) = 7.6

Calculate the square root of the right side: 2.75680975

Break this problem into two subproblems by setting 
(x + -2) equal to 2.75680975 and -2.75680975.

Subproblem 1

x + -2 = 2.75680975 Simplifying x + -2 = 2.75680975 Reorder the terms: -2 + x = 2.75680975 Solving -2 + x = 2.75680975 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 = 2.75680975 + 2 Combine like terms: -2 + 2 = 0 0 + x = 2.75680975 + 2 x = 2.75680975 + 2 Combine like terms: 2.75680975 + 2 = 4.75680975 x = 4.75680975 Simplifying x = 4.75680975

Subproblem 2

x + -2 = -2.75680975 Simplifying x + -2 = -2.75680975 Reorder the terms: -2 + x = -2.75680975 Solving -2 + x = -2.75680975 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 = -2.75680975 + 2 Combine like terms: -2 + 2 = 0 0 + x = -2.75680975 + 2 x = -2.75680975 + 2 Combine like terms: -2.75680975 + 2 = -0.75680975 x = -0.75680975 Simplifying x = -0.75680975

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.75680975, -0.75680975}

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