25x^2+12x-15=0

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Solution for 25x^2+12x-15=0 equation:


Simplifying
25x2 + 12x + -15 = 0

Reorder the terms:
-15 + 12x + 25x2 = 0

Solving
-15 + 12x + 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'.
-0.6 + 0.48x + x2 = 0

Move the constant term to the right:

Add '0.6' to each side of the equation.
-0.6 + 0.48x + 0.6 + x2 = 0 + 0.6

Reorder the terms:
-0.6 + 0.6 + 0.48x + x2 = 0 + 0.6

Combine like terms: -0.6 + 0.6 = 0.0
0.0 + 0.48x + x2 = 0 + 0.6
0.48x + x2 = 0 + 0.6

Combine like terms: 0 + 0.6 = 0.6
0.48x + x2 = 0.6

The x term is 0.48x.  Take half its coefficient (0.24).
Square it (0.0576) and add it to both sides.

Add '0.0576' to each side of the equation.
0.48x + 0.0576 + x2 = 0.6 + 0.0576

Reorder the terms:
0.0576 + 0.48x + x2 = 0.6 + 0.0576

Combine like terms: 0.6 + 0.0576 = 0.6576
0.0576 + 0.48x + x2 = 0.6576

Factor a perfect square on the left side:
(x + 0.24)(x + 0.24) = 0.6576

Calculate the square root of the right side: 0.810925397

Break this problem into two subproblems by setting 
(x + 0.24) equal to 0.810925397 and -0.810925397.

Subproblem 1

x + 0.24 = 0.810925397 Simplifying x + 0.24 = 0.810925397 Reorder the terms: 0.24 + x = 0.810925397 Solving 0.24 + x = 0.810925397 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.24' to each side of the equation. 0.24 + -0.24 + x = 0.810925397 + -0.24 Combine like terms: 0.24 + -0.24 = 0.00 0.00 + x = 0.810925397 + -0.24 x = 0.810925397 + -0.24 Combine like terms: 0.810925397 + -0.24 = 0.570925397 x = 0.570925397 Simplifying x = 0.570925397

Subproblem 2

x + 0.24 = -0.810925397 Simplifying x + 0.24 = -0.810925397 Reorder the terms: 0.24 + x = -0.810925397 Solving 0.24 + x = -0.810925397 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.24' to each side of the equation. 0.24 + -0.24 + x = -0.810925397 + -0.24 Combine like terms: 0.24 + -0.24 = 0.00 0.00 + x = -0.810925397 + -0.24 x = -0.810925397 + -0.24 Combine like terms: -0.810925397 + -0.24 = -1.050925397 x = -1.050925397 Simplifying x = -1.050925397

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.570925397, -1.050925397}

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