-2-28x=-5x^2

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


Simplifying
-2 + -28x = -5x2

Solving
-2 + -28x = -5x2

Solving for variable 'x'.

Combine like terms: -5x2 + 5x2 = 0
-2 + -28x + 5x2 = 0

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

Divide each side by '5'.
-0.4 + -5.6x + x2 = 0

Move the constant term to the right:

Add '0.4' to each side of the equation.
-0.4 + -5.6x + 0.4 + x2 = 0 + 0.4

Reorder the terms:
-0.4 + 0.4 + -5.6x + x2 = 0 + 0.4

Combine like terms: -0.4 + 0.4 = 0.0
0.0 + -5.6x + x2 = 0 + 0.4
-5.6x + x2 = 0 + 0.4

Combine like terms: 0 + 0.4 = 0.4
-5.6x + x2 = 0.4

The x term is -5.6x.  Take half its coefficient (-2.8).
Square it (7.84) and add it to both sides.

Add '7.84' to each side of the equation.
-5.6x + 7.84 + x2 = 0.4 + 7.84

Reorder the terms:
7.84 + -5.6x + x2 = 0.4 + 7.84

Combine like terms: 0.4 + 7.84 = 8.24
7.84 + -5.6x + x2 = 8.24

Factor a perfect square on the left side:
(x + -2.8)(x + -2.8) = 8.24

Calculate the square root of the right side: 2.870540019

Break this problem into two subproblems by setting 
(x + -2.8) equal to 2.870540019 and -2.870540019.

Subproblem 1

x + -2.8 = 2.870540019 Simplifying x + -2.8 = 2.870540019 Reorder the terms: -2.8 + x = 2.870540019 Solving -2.8 + x = 2.870540019 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.8' to each side of the equation. -2.8 + 2.8 + x = 2.870540019 + 2.8 Combine like terms: -2.8 + 2.8 = 0.0 0.0 + x = 2.870540019 + 2.8 x = 2.870540019 + 2.8 Combine like terms: 2.870540019 + 2.8 = 5.670540019 x = 5.670540019 Simplifying x = 5.670540019

Subproblem 2

x + -2.8 = -2.870540019 Simplifying x + -2.8 = -2.870540019 Reorder the terms: -2.8 + x = -2.870540019 Solving -2.8 + x = -2.870540019 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.8' to each side of the equation. -2.8 + 2.8 + x = -2.870540019 + 2.8 Combine like terms: -2.8 + 2.8 = 0.0 0.0 + x = -2.870540019 + 2.8 x = -2.870540019 + 2.8 Combine like terms: -2.870540019 + 2.8 = -0.070540019 x = -0.070540019 Simplifying x = -0.070540019

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.670540019, -0.070540019}

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