0=x^2+5x+6.25

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Solution for 0=x^2+5x+6.25 equation:


Simplifying
0 = x2 + 5x + 6.25

Reorder the terms:
0 = 6.25 + 5x + x2

Solving
0 = 6.25 + 5x + x2

Solving for variable 'x'.

Combine like terms: 0 + -6.25 = -6.25
-6.25 + -5x + -1x2 = 6.25 + 5x + x2 + -6.25 + -5x + -1x2

Reorder the terms:
-6.25 + -5x + -1x2 = 6.25 + -6.25 + 5x + -5x + x2 + -1x2

Combine like terms: 6.25 + -6.25 = 0.00
-6.25 + -5x + -1x2 = 0.00 + 5x + -5x + x2 + -1x2
-6.25 + -5x + -1x2 = 5x + -5x + x2 + -1x2

Combine like terms: 5x + -5x = 0
-6.25 + -5x + -1x2 = 0 + x2 + -1x2
-6.25 + -5x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-6.25 + -5x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
6.25 + 5x + x2 = 0

Move the constant term to the right:

Add '-6.25' to each side of the equation.
6.25 + 5x + -6.25 + x2 = 0 + -6.25

Reorder the terms:
6.25 + -6.25 + 5x + x2 = 0 + -6.25

Combine like terms: 6.25 + -6.25 = 0.00
0.00 + 5x + x2 = 0 + -6.25
5x + x2 = 0 + -6.25

Combine like terms: 0 + -6.25 = -6.25
5x + x2 = -6.25

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 = -6.25 + 6.25

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

Combine like terms: -6.25 + 6.25 = 0.00
6.25 + 5x + x2 = 0.00

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 0.00

Calculate the square root of the right side: 0.00

Break this problem into two subproblems by setting 
(x + 2.5) equal to 0.00 and 0.00.

Subproblem 1

x + 2.5 = 0.00 Simplifying x + 2.5 = 0.00 Reorder the terms: 2.5 + x = 0.00 Solving 2.5 + x = 0.00 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 = 0.00 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 0.00 + -2.5 x = 0.00 + -2.5 Combine like terms: 0.00 + -2.5 = -2.5 x = -2.5 Simplifying x = -2.5

Subproblem 2

x + 2.5 = 0.00 Simplifying x + 2.5 = 0.00 Reorder the terms: 2.5 + x = 0.00 Solving 2.5 + x = 0.00 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 = 0.00 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 0.00 + -2.5 x = 0.00 + -2.5 Combine like terms: 0.00 + -2.5 = -2.5 x = -2.5 Simplifying x = -2.5

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-2.5, -2.5}

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