5x^2-100x=28

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Solution for 5x^2-100x=28 equation:


Simplifying
5x2 + -100x = 28

Reorder the terms:
-100x + 5x2 = 28

Solving
-100x + 5x2 = 28

Solving for variable 'x'.

Reorder the terms:
-28 + -100x + 5x2 = 28 + -28

Combine like terms: 28 + -28 = 0
-28 + -100x + 5x2 = 0

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

Divide each side by '5'.
-5.6 + -20x + x2 = 0

Move the constant term to the right:

Add '5.6' to each side of the equation.
-5.6 + -20x + 5.6 + x2 = 0 + 5.6

Reorder the terms:
-5.6 + 5.6 + -20x + x2 = 0 + 5.6

Combine like terms: -5.6 + 5.6 = 0.0
0.0 + -20x + x2 = 0 + 5.6
-20x + x2 = 0 + 5.6

Combine like terms: 0 + 5.6 = 5.6
-20x + x2 = 5.6

The x term is -20x.  Take half its coefficient (-10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
-20x + 100 + x2 = 5.6 + 100

Reorder the terms:
100 + -20x + x2 = 5.6 + 100

Combine like terms: 5.6 + 100 = 105.6
100 + -20x + x2 = 105.6

Factor a perfect square on the left side:
(x + -10)(x + -10) = 105.6

Calculate the square root of the right side: 10.276186063

Break this problem into two subproblems by setting 
(x + -10) equal to 10.276186063 and -10.276186063.

Subproblem 1

x + -10 = 10.276186063 Simplifying x + -10 = 10.276186063 Reorder the terms: -10 + x = 10.276186063 Solving -10 + x = 10.276186063 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + x = 10.276186063 + 10 Combine like terms: -10 + 10 = 0 0 + x = 10.276186063 + 10 x = 10.276186063 + 10 Combine like terms: 10.276186063 + 10 = 20.276186063 x = 20.276186063 Simplifying x = 20.276186063

Subproblem 2

x + -10 = -10.276186063 Simplifying x + -10 = -10.276186063 Reorder the terms: -10 + x = -10.276186063 Solving -10 + x = -10.276186063 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + x = -10.276186063 + 10 Combine like terms: -10 + 10 = 0 0 + x = -10.276186063 + 10 x = -10.276186063 + 10 Combine like terms: -10.276186063 + 10 = -0.276186063 x = -0.276186063 Simplifying x = -0.276186063

Solution

The solution to the problem is based on the solutions from the subproblems. x = {20.276186063, -0.276186063}

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