25x^2-7x-125=0

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Solution for 25x^2-7x-125=0 equation:


Simplifying
25x2 + -7x + -125 = 0

Reorder the terms:
-125 + -7x + 25x2 = 0

Solving
-125 + -7x + 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'.
-5 + -0.28x + x2 = 0

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + -0.28x + 5 + x2 = 0 + 5

Reorder the terms:
-5 + 5 + -0.28x + x2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -0.28x + x2 = 0 + 5
-0.28x + x2 = 0 + 5

Combine like terms: 0 + 5 = 5
-0.28x + x2 = 5

The x term is -0.28x.  Take half its coefficient (-0.14).
Square it (0.0196) and add it to both sides.

Add '0.0196' to each side of the equation.
-0.28x + 0.0196 + x2 = 5 + 0.0196

Reorder the terms:
0.0196 + -0.28x + x2 = 5 + 0.0196

Combine like terms: 5 + 0.0196 = 5.0196
0.0196 + -0.28x + x2 = 5.0196

Factor a perfect square on the left side:
(x + -0.14)(x + -0.14) = 5.0196

Calculate the square root of the right side: 2.240446384

Break this problem into two subproblems by setting 
(x + -0.14) equal to 2.240446384 and -2.240446384.

Subproblem 1

x + -0.14 = 2.240446384 Simplifying x + -0.14 = 2.240446384 Reorder the terms: -0.14 + x = 2.240446384 Solving -0.14 + x = 2.240446384 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.14' to each side of the equation. -0.14 + 0.14 + x = 2.240446384 + 0.14 Combine like terms: -0.14 + 0.14 = 0.00 0.00 + x = 2.240446384 + 0.14 x = 2.240446384 + 0.14 Combine like terms: 2.240446384 + 0.14 = 2.380446384 x = 2.380446384 Simplifying x = 2.380446384

Subproblem 2

x + -0.14 = -2.240446384 Simplifying x + -0.14 = -2.240446384 Reorder the terms: -0.14 + x = -2.240446384 Solving -0.14 + x = -2.240446384 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.14' to each side of the equation. -0.14 + 0.14 + x = -2.240446384 + 0.14 Combine like terms: -0.14 + 0.14 = 0.00 0.00 + x = -2.240446384 + 0.14 x = -2.240446384 + 0.14 Combine like terms: -2.240446384 + 0.14 = -2.100446384 x = -2.100446384 Simplifying x = -2.100446384

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.380446384, -2.100446384}

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