2.5x^2-16x+22.5=0

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Solution for 2.5x^2-16x+22.5=0 equation:


Simplifying
2.5x2 + -16x + 22.5 = 0

Reorder the terms:
22.5 + -16x + 2.5x2 = 0

Solving
22.5 + -16x + 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'.
9 + -6.4x + x2 = 0

Move the constant term to the right:

Add '-9' to each side of the equation.
9 + -6.4x + -9 + x2 = 0 + -9

Reorder the terms:
9 + -9 + -6.4x + x2 = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -6.4x + x2 = 0 + -9
-6.4x + x2 = 0 + -9

Combine like terms: 0 + -9 = -9
-6.4x + x2 = -9

The x term is -6.4x.  Take half its coefficient (-3.2).
Square it (10.24) and add it to both sides.

Add '10.24' to each side of the equation.
-6.4x + 10.24 + x2 = -9 + 10.24

Reorder the terms:
10.24 + -6.4x + x2 = -9 + 10.24

Combine like terms: -9 + 10.24 = 1.24
10.24 + -6.4x + x2 = 1.24

Factor a perfect square on the left side:
(x + -3.2)(x + -3.2) = 1.24

Calculate the square root of the right side: 1.113552873

Break this problem into two subproblems by setting 
(x + -3.2) equal to 1.113552873 and -1.113552873.

Subproblem 1

x + -3.2 = 1.113552873 Simplifying x + -3.2 = 1.113552873 Reorder the terms: -3.2 + x = 1.113552873 Solving -3.2 + x = 1.113552873 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.2' to each side of the equation. -3.2 + 3.2 + x = 1.113552873 + 3.2 Combine like terms: -3.2 + 3.2 = 0.0 0.0 + x = 1.113552873 + 3.2 x = 1.113552873 + 3.2 Combine like terms: 1.113552873 + 3.2 = 4.313552873 x = 4.313552873 Simplifying x = 4.313552873

Subproblem 2

x + -3.2 = -1.113552873 Simplifying x + -3.2 = -1.113552873 Reorder the terms: -3.2 + x = -1.113552873 Solving -3.2 + x = -1.113552873 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.2' to each side of the equation. -3.2 + 3.2 + x = -1.113552873 + 3.2 Combine like terms: -3.2 + 3.2 = 0.0 0.0 + x = -1.113552873 + 3.2 x = -1.113552873 + 3.2 Combine like terms: -1.113552873 + 3.2 = 2.086447127 x = 2.086447127 Simplifying x = 2.086447127

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.313552873, 2.086447127}

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