(2.5(x^2))-20x+2=0

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Solution for (2.5(x^2))-20x+2=0 equation:


Simplifying
(2.5(x2)) + -20x + 2 = 0

Reorder the terms:
2 + -20x + (2.5x2) = 0

Solving
2 + -20x + (2.5x2) = 0

Solving for variable 'x'.

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

Divide each side by '2.5'.
0.8 + -8x + x2 = 0

Move the constant term to the right:

Add '-0.8' to each side of the equation.
0.8 + -8x + -0.8 + x2 = 0 + -0.8

Reorder the terms:
0.8 + -0.8 + -8x + x2 = 0 + -0.8

Combine like terms: 0.8 + -0.8 = 0.0
0.0 + -8x + x2 = 0 + -0.8
-8x + x2 = 0 + -0.8

Combine like terms: 0 + -0.8 = -0.8
-8x + x2 = -0.8

The x term is -8x.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8x + 16 + x2 = -0.8 + 16

Reorder the terms:
16 + -8x + x2 = -0.8 + 16

Combine like terms: -0.8 + 16 = 15.2
16 + -8x + x2 = 15.2

Factor a perfect square on the left side:
((x) + -4)((x) + -4) = 15.2

Calculate the square root of the right side: 3.898717738

Break this problem into two subproblems by setting 
((x) + -4) equal to 3.898717738 and -3.898717738.

Subproblem 1

(x) + -4 = 3.898717738 Simplifying (x) + -4 = 3.898717738 x + -4 = 3.898717738 Reorder the terms: -4 + x = 3.898717738 Solving -4 + x = 3.898717738 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = 3.898717738 + 4 Combine like terms: -4 + 4 = 0 0 + x = 3.898717738 + 4 x = 3.898717738 + 4 Combine like terms: 3.898717738 + 4 = 7.898717738 x = 7.898717738 Simplifying x = 7.898717738

Subproblem 2

(x) + -4 = -3.898717738 Simplifying (x) + -4 = -3.898717738 x + -4 = -3.898717738 Reorder the terms: -4 + x = -3.898717738 Solving -4 + x = -3.898717738 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = -3.898717738 + 4 Combine like terms: -4 + 4 = 0 0 + x = -3.898717738 + 4 x = -3.898717738 + 4 Combine like terms: -3.898717738 + 4 = 0.101282262 x = 0.101282262 Simplifying x = 0.101282262

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.898717738, 0.101282262}

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