25x^2+4x-12=0

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Solution for 25x^2+4x-12=0 equation:


Simplifying
25x2 + 4x + -12 = 0

Reorder the terms:
-12 + 4x + 25x2 = 0

Solving
-12 + 4x + 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 + 0.16x + x2 = 0

Move the constant term to the right:

Add '0.48' to each side of the equation.
-0.48 + 0.16x + 0.48 + x2 = 0 + 0.48

Reorder the terms:
-0.48 + 0.48 + 0.16x + x2 = 0 + 0.48

Combine like terms: -0.48 + 0.48 = 0.00
0.00 + 0.16x + x2 = 0 + 0.48
0.16x + x2 = 0 + 0.48

Combine like terms: 0 + 0.48 = 0.48
0.16x + x2 = 0.48

The x term is 0.16x.  Take half its coefficient (0.08).
Square it (0.0064) and add it to both sides.

Add '0.0064' to each side of the equation.
0.16x + 0.0064 + x2 = 0.48 + 0.0064

Reorder the terms:
0.0064 + 0.16x + x2 = 0.48 + 0.0064

Combine like terms: 0.48 + 0.0064 = 0.4864
0.0064 + 0.16x + x2 = 0.4864

Factor a perfect square on the left side:
(x + 0.08)(x + 0.08) = 0.4864

Calculate the square root of the right side: 0.697423831

Break this problem into two subproblems by setting 
(x + 0.08) equal to 0.697423831 and -0.697423831.

Subproblem 1

x + 0.08 = 0.697423831 Simplifying x + 0.08 = 0.697423831 Reorder the terms: 0.08 + x = 0.697423831 Solving 0.08 + x = 0.697423831 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.08' to each side of the equation. 0.08 + -0.08 + x = 0.697423831 + -0.08 Combine like terms: 0.08 + -0.08 = 0.00 0.00 + x = 0.697423831 + -0.08 x = 0.697423831 + -0.08 Combine like terms: 0.697423831 + -0.08 = 0.617423831 x = 0.617423831 Simplifying x = 0.617423831

Subproblem 2

x + 0.08 = -0.697423831 Simplifying x + 0.08 = -0.697423831 Reorder the terms: 0.08 + x = -0.697423831 Solving 0.08 + x = -0.697423831 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.08' to each side of the equation. 0.08 + -0.08 + x = -0.697423831 + -0.08 Combine like terms: 0.08 + -0.08 = 0.00 0.00 + x = -0.697423831 + -0.08 x = -0.697423831 + -0.08 Combine like terms: -0.697423831 + -0.08 = -0.777423831 x = -0.777423831 Simplifying x = -0.777423831

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.617423831, -0.777423831}

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