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 = 8.05
6.25 + -5x + x2 = 8.05

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 8.05

Calculate the square root of the right side: 2.837252192

Break this problem into two subproblems by setting 
(x + -2.5) equal to 2.837252192 and -2.837252192.

Subproblem 1

x + -2.5 = 2.837252192 Simplifying x + -2.5 = 2.837252192 Reorder the terms: -2.5 + x = 2.837252192 Solving -2.5 + x = 2.837252192 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 = 2.837252192 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = 2.837252192 + 2.5 x = 2.837252192 + 2.5 Combine like terms: 2.837252192 + 2.5 = 5.337252192 x = 5.337252192 Simplifying x = 5.337252192

Subproblem 2

x + -2.5 = -2.837252192 Simplifying x + -2.5 = -2.837252192 Reorder the terms: -2.5 + x = -2.837252192 Solving -2.5 + x = -2.837252192 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 = -2.837252192 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = -2.837252192 + 2.5 x = -2.837252192 + 2.5 Combine like terms: -2.837252192 + 2.5 = -0.337252192 x = -0.337252192 Simplifying x = -0.337252192

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.337252192, -0.337252192}

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