0.1x^2+5x+2.6=0

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Solution for 0.1x^2+5x+2.6=0 equation:


Simplifying
0.1x2 + 5x + 2.6 = 0

Reorder the terms:
2.6 + 5x + 0.1x2 = 0

Solving
2.6 + 5x + 0.1x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.1'.
26 + 50x + x2 = 0

Move the constant term to the right:

Add '-26' to each side of the equation.
26 + 50x + -26 + x2 = 0 + -26

Reorder the terms:
26 + -26 + 50x + x2 = 0 + -26

Combine like terms: 26 + -26 = 0
0 + 50x + x2 = 0 + -26
50x + x2 = 0 + -26

Combine like terms: 0 + -26 = -26
50x + x2 = -26

The x term is 50x.  Take half its coefficient (25).
Square it (625) and add it to both sides.

Add '625' to each side of the equation.
50x + 625 + x2 = -26 + 625

Reorder the terms:
625 + 50x + x2 = -26 + 625

Combine like terms: -26 + 625 = 599
625 + 50x + x2 = 599

Factor a perfect square on the left side:
(x + 25)(x + 25) = 599

Calculate the square root of the right side: 24.474476501

Break this problem into two subproblems by setting 
(x + 25) equal to 24.474476501 and -24.474476501.

Subproblem 1

x + 25 = 24.474476501 Simplifying x + 25 = 24.474476501 Reorder the terms: 25 + x = 24.474476501 Solving 25 + x = 24.474476501 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-25' to each side of the equation. 25 + -25 + x = 24.474476501 + -25 Combine like terms: 25 + -25 = 0 0 + x = 24.474476501 + -25 x = 24.474476501 + -25 Combine like terms: 24.474476501 + -25 = -0.525523499 x = -0.525523499 Simplifying x = -0.525523499

Subproblem 2

x + 25 = -24.474476501 Simplifying x + 25 = -24.474476501 Reorder the terms: 25 + x = -24.474476501 Solving 25 + x = -24.474476501 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-25' to each side of the equation. 25 + -25 + x = -24.474476501 + -25 Combine like terms: 25 + -25 = 0 0 + x = -24.474476501 + -25 x = -24.474476501 + -25 Combine like terms: -24.474476501 + -25 = -49.474476501 x = -49.474476501 Simplifying x = -49.474476501

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.525523499, -49.474476501}

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