5x^2-25x+9=0

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Solution for 5x^2-25x+9=0 equation:


Simplifying
5x2 + -25x + 9 = 0

Reorder the terms:
9 + -25x + 5x2 = 0

Solving
9 + -25x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
1.8 + -5x + x2 = 0

Move the constant term to the right:

Add '-1.8' to each side of the equation.
1.8 + -5x + -1.8 + x2 = 0 + -1.8

Reorder the terms:
1.8 + -1.8 + -5x + x2 = 0 + -1.8

Combine like terms: 1.8 + -1.8 = 0.0
0.0 + -5x + x2 = 0 + -1.8
-5x + x2 = 0 + -1.8

Combine like terms: 0 + -1.8 = -1.8
-5x + x2 = -1.8

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 = -1.8 + 6.25

Reorder the terms:
6.25 + -5x + x2 = -1.8 + 6.25

Combine like terms: -1.8 + 6.25 = 4.45
6.25 + -5x + x2 = 4.45

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 4.45

Calculate the square root of the right side: 2.109502311

Break this problem into two subproblems by setting 
(x + -2.5) equal to 2.109502311 and -2.109502311.

Subproblem 1

x + -2.5 = 2.109502311 Simplifying x + -2.5 = 2.109502311 Reorder the terms: -2.5 + x = 2.109502311 Solving -2.5 + x = 2.109502311 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 = 2.109502311 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = 2.109502311 + 2.5 x = 2.109502311 + 2.5 Combine like terms: 2.109502311 + 2.5 = 4.609502311 x = 4.609502311 Simplifying x = 4.609502311

Subproblem 2

x + -2.5 = -2.109502311 Simplifying x + -2.5 = -2.109502311 Reorder the terms: -2.5 + x = -2.109502311 Solving -2.5 + x = -2.109502311 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 = -2.109502311 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = -2.109502311 + 2.5 x = -2.109502311 + 2.5 Combine like terms: -2.109502311 + 2.5 = 0.390497689 x = 0.390497689 Simplifying x = 0.390497689

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.609502311, 0.390497689}

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