5x^2-20x=28

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Solution for 5x^2-20x=28 equation:


Simplifying
5x2 + -20x = 28

Reorder the terms:
-20x + 5x2 = 28

Solving
-20x + 5x2 = 28

Solving for variable 'x'.

Reorder the terms:
-28 + -20x + 5x2 = 28 + -28

Combine like terms: 28 + -28 = 0
-28 + -20x + 5x2 = 0

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

Divide each side by '5'.
-5.6 + -4x + x2 = 0

Move the constant term to the right:

Add '5.6' to each side of the equation.
-5.6 + -4x + 5.6 + x2 = 0 + 5.6

Reorder the terms:
-5.6 + 5.6 + -4x + x2 = 0 + 5.6

Combine like terms: -5.6 + 5.6 = 0.0
0.0 + -4x + x2 = 0 + 5.6
-4x + x2 = 0 + 5.6

Combine like terms: 0 + 5.6 = 5.6
-4x + x2 = 5.6

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 = 5.6 + 4

Reorder the terms:
4 + -4x + x2 = 5.6 + 4

Combine like terms: 5.6 + 4 = 9.6
4 + -4x + x2 = 9.6

Factor a perfect square on the left side:
(x + -2)(x + -2) = 9.6

Calculate the square root of the right side: 3.098386677

Break this problem into two subproblems by setting 
(x + -2) equal to 3.098386677 and -3.098386677.

Subproblem 1

x + -2 = 3.098386677 Simplifying x + -2 = 3.098386677 Reorder the terms: -2 + x = 3.098386677 Solving -2 + x = 3.098386677 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 = 3.098386677 + 2 Combine like terms: -2 + 2 = 0 0 + x = 3.098386677 + 2 x = 3.098386677 + 2 Combine like terms: 3.098386677 + 2 = 5.098386677 x = 5.098386677 Simplifying x = 5.098386677

Subproblem 2

x + -2 = -3.098386677 Simplifying x + -2 = -3.098386677 Reorder the terms: -2 + x = -3.098386677 Solving -2 + x = -3.098386677 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 = -3.098386677 + 2 Combine like terms: -2 + 2 = 0 0 + x = -3.098386677 + 2 x = -3.098386677 + 2 Combine like terms: -3.098386677 + 2 = -1.098386677 x = -1.098386677 Simplifying x = -1.098386677

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.098386677, -1.098386677}

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