5x^2-2x-100=0

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


Simplifying
5x2 + -2x + -100 = 0

Reorder the terms:
-100 + -2x + 5x2 = 0

Solving
-100 + -2x + 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 + -0.4x + x2 = 0

Move the constant term to the right:

Add '20' to each side of the equation.
-20 + -0.4x + 20 + x2 = 0 + 20

Reorder the terms:
-20 + 20 + -0.4x + x2 = 0 + 20

Combine like terms: -20 + 20 = 0
0 + -0.4x + x2 = 0 + 20
-0.4x + x2 = 0 + 20

Combine like terms: 0 + 20 = 20
-0.4x + x2 = 20

The x term is -0.4x.  Take half its coefficient (-0.2).
Square it (0.04) and add it to both sides.

Add '0.04' to each side of the equation.
-0.4x + 0.04 + x2 = 20 + 0.04

Reorder the terms:
0.04 + -0.4x + x2 = 20 + 0.04

Combine like terms: 20 + 0.04 = 20.04
0.04 + -0.4x + x2 = 20.04

Factor a perfect square on the left side:
(x + -0.2)(x + -0.2) = 20.04

Calculate the square root of the right side: 4.476605857

Break this problem into two subproblems by setting 
(x + -0.2) equal to 4.476605857 and -4.476605857.

Subproblem 1

x + -0.2 = 4.476605857 Simplifying x + -0.2 = 4.476605857 Reorder the terms: -0.2 + x = 4.476605857 Solving -0.2 + x = 4.476605857 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2' to each side of the equation. -0.2 + 0.2 + x = 4.476605857 + 0.2 Combine like terms: -0.2 + 0.2 = 0.0 0.0 + x = 4.476605857 + 0.2 x = 4.476605857 + 0.2 Combine like terms: 4.476605857 + 0.2 = 4.676605857 x = 4.676605857 Simplifying x = 4.676605857

Subproblem 2

x + -0.2 = -4.476605857 Simplifying x + -0.2 = -4.476605857 Reorder the terms: -0.2 + x = -4.476605857 Solving -0.2 + x = -4.476605857 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2' to each side of the equation. -0.2 + 0.2 + x = -4.476605857 + 0.2 Combine like terms: -0.2 + 0.2 = 0.0 0.0 + x = -4.476605857 + 0.2 x = -4.476605857 + 0.2 Combine like terms: -4.476605857 + 0.2 = -4.276605857 x = -4.276605857 Simplifying x = -4.276605857

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.676605857, -4.276605857}

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