25x^2+15x+1=0

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Solution for 25x^2+15x+1=0 equation:


Simplifying
25x2 + 15x + 1 = 0

Reorder the terms:
1 + 15x + 25x2 = 0

Solving
1 + 15x + 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'.
0.04 + 0.6x + x2 = 0

Move the constant term to the right:

Add '-0.04' to each side of the equation.
0.04 + 0.6x + -0.04 + x2 = 0 + -0.04

Reorder the terms:
0.04 + -0.04 + 0.6x + x2 = 0 + -0.04

Combine like terms: 0.04 + -0.04 = 0.00
0.00 + 0.6x + x2 = 0 + -0.04
0.6x + x2 = 0 + -0.04

Combine like terms: 0 + -0.04 = -0.04
0.6x + x2 = -0.04

The x term is 0.6x.  Take half its coefficient (0.3).
Square it (0.09) and add it to both sides.

Add '0.09' to each side of the equation.
0.6x + 0.09 + x2 = -0.04 + 0.09

Reorder the terms:
0.09 + 0.6x + x2 = -0.04 + 0.09

Combine like terms: -0.04 + 0.09 = 0.05
0.09 + 0.6x + x2 = 0.05

Factor a perfect square on the left side:
(x + 0.3)(x + 0.3) = 0.05

Calculate the square root of the right side: 0.223606798

Break this problem into two subproblems by setting 
(x + 0.3) equal to 0.223606798 and -0.223606798.

Subproblem 1

x + 0.3 = 0.223606798 Simplifying x + 0.3 = 0.223606798 Reorder the terms: 0.3 + x = 0.223606798 Solving 0.3 + x = 0.223606798 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3' to each side of the equation. 0.3 + -0.3 + x = 0.223606798 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + x = 0.223606798 + -0.3 x = 0.223606798 + -0.3 Combine like terms: 0.223606798 + -0.3 = -0.076393202 x = -0.076393202 Simplifying x = -0.076393202

Subproblem 2

x + 0.3 = -0.223606798 Simplifying x + 0.3 = -0.223606798 Reorder the terms: 0.3 + x = -0.223606798 Solving 0.3 + x = -0.223606798 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3' to each side of the equation. 0.3 + -0.3 + x = -0.223606798 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + x = -0.223606798 + -0.3 x = -0.223606798 + -0.3 Combine like terms: -0.223606798 + -0.3 = -0.523606798 x = -0.523606798 Simplifying x = -0.523606798

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.076393202, -0.523606798}

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