8x^2-25x-12=0

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Solution for 8x^2-25x-12=0 equation:


Simplifying
8x2 + -25x + -12 = 0

Reorder the terms:
-12 + -25x + 8x2 = 0

Solving
-12 + -25x + 8x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
8 the coefficient of the squared term: 

Divide each side by '8'.
-1.5 + -3.125x + x2 = 0

Move the constant term to the right:

Add '1.5' to each side of the equation.
-1.5 + -3.125x + 1.5 + x2 = 0 + 1.5

Reorder the terms:
-1.5 + 1.5 + -3.125x + x2 = 0 + 1.5

Combine like terms: -1.5 + 1.5 = 0.0
0.0 + -3.125x + x2 = 0 + 1.5
-3.125x + x2 = 0 + 1.5

Combine like terms: 0 + 1.5 = 1.5
-3.125x + x2 = 1.5

The x term is -3.125x.  Take half its coefficient (-1.5625).
Square it (2.44140625) and add it to both sides.

Add '2.44140625' to each side of the equation.
-3.125x + 2.44140625 + x2 = 1.5 + 2.44140625

Reorder the terms:
2.44140625 + -3.125x + x2 = 1.5 + 2.44140625

Combine like terms: 1.5 + 2.44140625 = 3.94140625
2.44140625 + -3.125x + x2 = 3.94140625

Factor a perfect square on the left side:
(x + -1.5625)(x + -1.5625) = 3.94140625

Calculate the square root of the right side: 1.985297522

Break this problem into two subproblems by setting 
(x + -1.5625) equal to 1.985297522 and -1.985297522.

Subproblem 1

x + -1.5625 = 1.985297522 Simplifying x + -1.5625 = 1.985297522 Reorder the terms: -1.5625 + x = 1.985297522 Solving -1.5625 + x = 1.985297522 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5625' to each side of the equation. -1.5625 + 1.5625 + x = 1.985297522 + 1.5625 Combine like terms: -1.5625 + 1.5625 = 0.0000 0.0000 + x = 1.985297522 + 1.5625 x = 1.985297522 + 1.5625 Combine like terms: 1.985297522 + 1.5625 = 3.547797522 x = 3.547797522 Simplifying x = 3.547797522

Subproblem 2

x + -1.5625 = -1.985297522 Simplifying x + -1.5625 = -1.985297522 Reorder the terms: -1.5625 + x = -1.985297522 Solving -1.5625 + x = -1.985297522 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5625' to each side of the equation. -1.5625 + 1.5625 + x = -1.985297522 + 1.5625 Combine like terms: -1.5625 + 1.5625 = 0.0000 0.0000 + x = -1.985297522 + 1.5625 x = -1.985297522 + 1.5625 Combine like terms: -1.985297522 + 1.5625 = -0.422797522 x = -0.422797522 Simplifying x = -0.422797522

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.547797522, -0.422797522}

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