25x^2-3x-12=0

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Solution for 25x^2-3x-12=0 equation:


Simplifying
25x2 + -3x + -12 = 0

Reorder the terms:
-12 + -3x + 25x2 = 0

Solving
-12 + -3x + 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'.
-0.48 + -0.12x + x2 = 0

Move the constant term to the right:

Add '0.48' to each side of the equation.
-0.48 + -0.12x + 0.48 + x2 = 0 + 0.48

Reorder the terms:
-0.48 + 0.48 + -0.12x + x2 = 0 + 0.48

Combine like terms: -0.48 + 0.48 = 0.00
0.00 + -0.12x + x2 = 0 + 0.48
-0.12x + x2 = 0 + 0.48

Combine like terms: 0 + 0.48 = 0.48
-0.12x + x2 = 0.48

The x term is -0.12x.  Take half its coefficient (-0.06).
Square it (0.0036) and add it to both sides.

Add '0.0036' to each side of the equation.
-0.12x + 0.0036 + x2 = 0.48 + 0.0036

Reorder the terms:
0.0036 + -0.12x + x2 = 0.48 + 0.0036

Combine like terms: 0.48 + 0.0036 = 0.4836
0.0036 + -0.12x + x2 = 0.4836

Factor a perfect square on the left side:
(x + -0.06)(x + -0.06) = 0.4836

Calculate the square root of the right side: 0.695413546

Break this problem into two subproblems by setting 
(x + -0.06) equal to 0.695413546 and -0.695413546.

Subproblem 1

x + -0.06 = 0.695413546 Simplifying x + -0.06 = 0.695413546 Reorder the terms: -0.06 + x = 0.695413546 Solving -0.06 + x = 0.695413546 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.06' to each side of the equation. -0.06 + 0.06 + x = 0.695413546 + 0.06 Combine like terms: -0.06 + 0.06 = 0.00 0.00 + x = 0.695413546 + 0.06 x = 0.695413546 + 0.06 Combine like terms: 0.695413546 + 0.06 = 0.755413546 x = 0.755413546 Simplifying x = 0.755413546

Subproblem 2

x + -0.06 = -0.695413546 Simplifying x + -0.06 = -0.695413546 Reorder the terms: -0.06 + x = -0.695413546 Solving -0.06 + x = -0.695413546 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.06' to each side of the equation. -0.06 + 0.06 + x = -0.695413546 + 0.06 Combine like terms: -0.06 + 0.06 = 0.00 0.00 + x = -0.695413546 + 0.06 x = -0.695413546 + 0.06 Combine like terms: -0.695413546 + 0.06 = -0.635413546 x = -0.635413546 Simplifying x = -0.635413546

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.755413546, -0.635413546}

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