-8x^2+25x+3=0

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Solution for -8x^2+25x+3=0 equation:


Simplifying
-8x2 + 25x + 3 = 0

Reorder the terms:
3 + 25x + -8x2 = 0

Solving
3 + 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'.
-0.375 + -3.125x + x2 = 0

Move the constant term to the right:

Add '0.375' to each side of the equation.
-0.375 + -3.125x + 0.375 + x2 = 0 + 0.375

Reorder the terms:
-0.375 + 0.375 + -3.125x + x2 = 0 + 0.375

Combine like terms: -0.375 + 0.375 = 0.000
0.000 + -3.125x + x2 = 0 + 0.375
-3.125x + x2 = 0 + 0.375

Combine like terms: 0 + 0.375 = 0.375
-3.125x + x2 = 0.375

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 = 0.375 + 2.44140625

Reorder the terms:
2.44140625 + -3.125x + x2 = 0.375 + 2.44140625

Combine like terms: 0.375 + 2.44140625 = 2.81640625
2.44140625 + -3.125x + x2 = 2.81640625

Factor a perfect square on the left side:
(x + -1.5625)(x + -1.5625) = 2.81640625

Calculate the square root of the right side: 1.678215198

Break this problem into two subproblems by setting 
(x + -1.5625) equal to 1.678215198 and -1.678215198.

Subproblem 1

x + -1.5625 = 1.678215198 Simplifying x + -1.5625 = 1.678215198 Reorder the terms: -1.5625 + x = 1.678215198 Solving -1.5625 + x = 1.678215198 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 = 1.678215198 + 1.5625 Combine like terms: -1.5625 + 1.5625 = 0.0000 0.0000 + x = 1.678215198 + 1.5625 x = 1.678215198 + 1.5625 Combine like terms: 1.678215198 + 1.5625 = 3.240715198 x = 3.240715198 Simplifying x = 3.240715198

Subproblem 2

x + -1.5625 = -1.678215198 Simplifying x + -1.5625 = -1.678215198 Reorder the terms: -1.5625 + x = -1.678215198 Solving -1.5625 + x = -1.678215198 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 = -1.678215198 + 1.5625 Combine like terms: -1.5625 + 1.5625 = 0.0000 0.0000 + x = -1.678215198 + 1.5625 x = -1.678215198 + 1.5625 Combine like terms: -1.678215198 + 1.5625 = -0.115715198 x = -0.115715198 Simplifying x = -0.115715198

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.240715198, -0.115715198}

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