25x^2+20x+2=0

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Solution for 25x^2+20x+2=0 equation:


Simplifying
25x2 + 20x + 2 = 0

Reorder the terms:
2 + 20x + 25x2 = 0

Solving
2 + 20x + 25x2 = 0

Solving for variable 'x'.

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

Divide each side by '25'.
0.08 + 0.8x + x2 = 0

Move the constant term to the right:

Add '-0.08' to each side of the equation.
0.08 + 0.8x + -0.08 + x2 = 0 + -0.08

Reorder the terms:
0.08 + -0.08 + 0.8x + x2 = 0 + -0.08

Combine like terms: 0.08 + -0.08 = 0.00
0.00 + 0.8x + x2 = 0 + -0.08
0.8x + x2 = 0 + -0.08

Combine like terms: 0 + -0.08 = -0.08
0.8x + x2 = -0.08

The x term is 0.8x.  Take half its coefficient (0.4).
Square it (0.16) and add it to both sides.

Add '0.16' to each side of the equation.
0.8x + 0.16 + x2 = -0.08 + 0.16

Reorder the terms:
0.16 + 0.8x + x2 = -0.08 + 0.16

Combine like terms: -0.08 + 0.16 = 0.08
0.16 + 0.8x + x2 = 0.08

Factor a perfect square on the left side:
(x + 0.4)(x + 0.4) = 0.08

Calculate the square root of the right side: 0.282842712

Break this problem into two subproblems by setting 
(x + 0.4) equal to 0.282842712 and -0.282842712.

Subproblem 1

x + 0.4 = 0.282842712 Simplifying x + 0.4 = 0.282842712 Reorder the terms: 0.4 + x = 0.282842712 Solving 0.4 + x = 0.282842712 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4' to each side of the equation. 0.4 + -0.4 + x = 0.282842712 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + x = 0.282842712 + -0.4 x = 0.282842712 + -0.4 Combine like terms: 0.282842712 + -0.4 = -0.117157288 x = -0.117157288 Simplifying x = -0.117157288

Subproblem 2

x + 0.4 = -0.282842712 Simplifying x + 0.4 = -0.282842712 Reorder the terms: 0.4 + x = -0.282842712 Solving 0.4 + x = -0.282842712 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4' to each side of the equation. 0.4 + -0.4 + x = -0.282842712 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + x = -0.282842712 + -0.4 x = -0.282842712 + -0.4 Combine like terms: -0.282842712 + -0.4 = -0.682842712 x = -0.682842712 Simplifying x = -0.682842712

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.117157288, -0.682842712}

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