101.25=-25x+5x^2

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Solution for 101.25=-25x+5x^2 equation:


Simplifying
101.25 = -25x + 5x2

Solving
101.25 = -25x + 5x2

Solving for variable 'x'.

Reorder the terms:
101.25 + 25x + -5x2 = -25x + 25x + 5x2 + -5x2

Combine like terms: -25x + 25x = 0
101.25 + 25x + -5x2 = 0 + 5x2 + -5x2
101.25 + 25x + -5x2 = 5x2 + -5x2

Combine like terms: 5x2 + -5x2 = 0
101.25 + 25x + -5x2 = 0

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

Divide each side by '-5'.
-20.25 + -5x + x2 = 0

Move the constant term to the right:

Add '20.25' to each side of the equation.
-20.25 + -5x + 20.25 + x2 = 0 + 20.25

Reorder the terms:
-20.25 + 20.25 + -5x + x2 = 0 + 20.25

Combine like terms: -20.25 + 20.25 = 0.00
0.00 + -5x + x2 = 0 + 20.25
-5x + x2 = 0 + 20.25

Combine like terms: 0 + 20.25 = 20.25
-5x + x2 = 20.25

The x term is -5x.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5x + 6.25 + x2 = 20.25 + 6.25

Reorder the terms:
6.25 + -5x + x2 = 20.25 + 6.25

Combine like terms: 20.25 + 6.25 = 26.5
6.25 + -5x + x2 = 26.5

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 26.5

Calculate the square root of the right side: 5.14781507

Break this problem into two subproblems by setting 
(x + -2.5) equal to 5.14781507 and -5.14781507.

Subproblem 1

x + -2.5 = 5.14781507 Simplifying x + -2.5 = 5.14781507 Reorder the terms: -2.5 + x = 5.14781507 Solving -2.5 + x = 5.14781507 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = 5.14781507 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = 5.14781507 + 2.5 x = 5.14781507 + 2.5 Combine like terms: 5.14781507 + 2.5 = 7.64781507 x = 7.64781507 Simplifying x = 7.64781507

Subproblem 2

x + -2.5 = -5.14781507 Simplifying x + -2.5 = -5.14781507 Reorder the terms: -2.5 + x = -5.14781507 Solving -2.5 + x = -5.14781507 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = -5.14781507 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = -5.14781507 + 2.5 x = -5.14781507 + 2.5 Combine like terms: -5.14781507 + 2.5 = -2.64781507 x = -2.64781507 Simplifying x = -2.64781507

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.64781507, -2.64781507}

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