5x^2-8x-100=0

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Solution for 5x^2-8x-100=0 equation:


Simplifying
5x2 + -8x + -100 = 0

Reorder the terms:
-100 + -8x + 5x2 = 0

Solving
-100 + -8x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
-20 + -1.6x + x2 = 0

Move the constant term to the right:

Add '20' to each side of the equation.
-20 + -1.6x + 20 + x2 = 0 + 20

Reorder the terms:
-20 + 20 + -1.6x + x2 = 0 + 20

Combine like terms: -20 + 20 = 0
0 + -1.6x + x2 = 0 + 20
-1.6x + x2 = 0 + 20

Combine like terms: 0 + 20 = 20
-1.6x + x2 = 20

The x term is -1.6x.  Take half its coefficient (-0.8).
Square it (0.64) and add it to both sides.

Add '0.64' to each side of the equation.
-1.6x + 0.64 + x2 = 20 + 0.64

Reorder the terms:
0.64 + -1.6x + x2 = 20 + 0.64

Combine like terms: 20 + 0.64 = 20.64
0.64 + -1.6x + x2 = 20.64

Factor a perfect square on the left side:
(x + -0.8)(x + -0.8) = 20.64

Calculate the square root of the right side: 4.543126677

Break this problem into two subproblems by setting 
(x + -0.8) equal to 4.543126677 and -4.543126677.

Subproblem 1

x + -0.8 = 4.543126677 Simplifying x + -0.8 = 4.543126677 Reorder the terms: -0.8 + x = 4.543126677 Solving -0.8 + x = 4.543126677 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8' to each side of the equation. -0.8 + 0.8 + x = 4.543126677 + 0.8 Combine like terms: -0.8 + 0.8 = 0.0 0.0 + x = 4.543126677 + 0.8 x = 4.543126677 + 0.8 Combine like terms: 4.543126677 + 0.8 = 5.343126677 x = 5.343126677 Simplifying x = 5.343126677

Subproblem 2

x + -0.8 = -4.543126677 Simplifying x + -0.8 = -4.543126677 Reorder the terms: -0.8 + x = -4.543126677 Solving -0.8 + x = -4.543126677 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8' to each side of the equation. -0.8 + 0.8 + x = -4.543126677 + 0.8 Combine like terms: -0.8 + 0.8 = 0.0 0.0 + x = -4.543126677 + 0.8 x = -4.543126677 + 0.8 Combine like terms: -4.543126677 + 0.8 = -3.743126677 x = -3.743126677 Simplifying x = -3.743126677

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.343126677, -3.743126677}

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