(5x^2)-20x=4

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Solution for (5x^2)-20x=4 equation:


Simplifying
(5x2) + -20x = 4

Reorder the terms:
-20x + (5x2) = 4

Solving
-20x + (5x2) = 4

Solving for variable 'x'.

Reorder the terms:
-4 + -20x + (5x2) = 4 + -4

Combine like terms: 4 + -4 = 0
-4 + -20x + (5x2) = 0

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

Divide each side by '5'.
-0.8 + -4x + x2 = 0

Move the constant term to the right:

Add '0.8' to each side of the equation.
-0.8 + -4x + 0.8 + x2 = 0 + 0.8

Reorder the terms:
-0.8 + 0.8 + -4x + x2 = 0 + 0.8

Combine like terms: -0.8 + 0.8 = 0.0
0.0 + -4x + x2 = 0 + 0.8
-4x + x2 = 0 + 0.8

Combine like terms: 0 + 0.8 = 0.8
-4x + x2 = 0.8

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 = 0.8 + 4

Reorder the terms:
4 + -4x + x2 = 0.8 + 4

Combine like terms: 0.8 + 4 = 4.8
4 + -4x + x2 = 4.8

Factor a perfect square on the left side:
((x) + -2)((x) + -2) = 4.8

Calculate the square root of the right side: 2.19089023

Break this problem into two subproblems by setting 
((x) + -2) equal to 2.19089023 and -2.19089023.

Subproblem 1

(x) + -2 = 2.19089023 Simplifying (x) + -2 = 2.19089023 x + -2 = 2.19089023 Reorder the terms: -2 + x = 2.19089023 Solving -2 + x = 2.19089023 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 = 2.19089023 + 2 Combine like terms: -2 + 2 = 0 0 + x = 2.19089023 + 2 x = 2.19089023 + 2 Combine like terms: 2.19089023 + 2 = 4.19089023 x = 4.19089023 Simplifying x = 4.19089023

Subproblem 2

(x) + -2 = -2.19089023 Simplifying (x) + -2 = -2.19089023 x + -2 = -2.19089023 Reorder the terms: -2 + x = -2.19089023 Solving -2 + x = -2.19089023 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 = -2.19089023 + 2 Combine like terms: -2 + 2 = 0 0 + x = -2.19089023 + 2 x = -2.19089023 + 2 Combine like terms: -2.19089023 + 2 = -0.19089023 x = -0.19089023 Simplifying x = -0.19089023

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.19089023, -0.19089023}

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