5x^2-2x-89=0

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Solution for 5x^2-2x-89=0 equation:


Simplifying
5x2 + -2x + -89 = 0

Reorder the terms:
-89 + -2x + 5x2 = 0

Solving
-89 + -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'.
-17.8 + -0.4x + x2 = 0

Move the constant term to the right:

Add '17.8' to each side of the equation.
-17.8 + -0.4x + 17.8 + x2 = 0 + 17.8

Reorder the terms:
-17.8 + 17.8 + -0.4x + x2 = 0 + 17.8

Combine like terms: -17.8 + 17.8 = 0.0
0.0 + -0.4x + x2 = 0 + 17.8
-0.4x + x2 = 0 + 17.8

Combine like terms: 0 + 17.8 = 17.8
-0.4x + x2 = 17.8

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 = 17.8 + 0.04

Reorder the terms:
0.04 + -0.4x + x2 = 17.8 + 0.04

Combine like terms: 17.8 + 0.04 = 17.84
0.04 + -0.4x + x2 = 17.84

Factor a perfect square on the left side:
(x + -0.2)(x + -0.2) = 17.84

Calculate the square root of the right side: 4.223742416

Break this problem into two subproblems by setting 
(x + -0.2) equal to 4.223742416 and -4.223742416.

Subproblem 1

x + -0.2 = 4.223742416 Simplifying x + -0.2 = 4.223742416 Reorder the terms: -0.2 + x = 4.223742416 Solving -0.2 + x = 4.223742416 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 = 4.223742416 + 0.2 Combine like terms: -0.2 + 0.2 = 0.0 0.0 + x = 4.223742416 + 0.2 x = 4.223742416 + 0.2 Combine like terms: 4.223742416 + 0.2 = 4.423742416 x = 4.423742416 Simplifying x = 4.423742416

Subproblem 2

x + -0.2 = -4.223742416 Simplifying x + -0.2 = -4.223742416 Reorder the terms: -0.2 + x = -4.223742416 Solving -0.2 + x = -4.223742416 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 = -4.223742416 + 0.2 Combine like terms: -0.2 + 0.2 = 0.0 0.0 + x = -4.223742416 + 0.2 x = -4.223742416 + 0.2 Combine like terms: -4.223742416 + 0.2 = -4.023742416 x = -4.023742416 Simplifying x = -4.023742416

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.423742416, -4.023742416}

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