10x^2-5x-4=0

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Solution for 10x^2-5x-4=0 equation:


Simplifying
10x2 + -5x + -4 = 0

Reorder the terms:
-4 + -5x + 10x2 = 0

Solving
-4 + -5x + 10x2 = 0

Solving for variable 'x'.

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

Divide each side by '10'.
-0.4 + -0.5x + x2 = 0

Move the constant term to the right:

Add '0.4' to each side of the equation.
-0.4 + -0.5x + 0.4 + x2 = 0 + 0.4

Reorder the terms:
-0.4 + 0.4 + -0.5x + x2 = 0 + 0.4

Combine like terms: -0.4 + 0.4 = 0.0
0.0 + -0.5x + x2 = 0 + 0.4
-0.5x + x2 = 0 + 0.4

Combine like terms: 0 + 0.4 = 0.4
-0.5x + x2 = 0.4

The x term is -0.5x.  Take half its coefficient (-0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
-0.5x + 0.0625 + x2 = 0.4 + 0.0625

Reorder the terms:
0.0625 + -0.5x + x2 = 0.4 + 0.0625

Combine like terms: 0.4 + 0.0625 = 0.4625
0.0625 + -0.5x + x2 = 0.4625

Factor a perfect square on the left side:
(x + -0.25)(x + -0.25) = 0.4625

Calculate the square root of the right side: 0.680073525

Break this problem into two subproblems by setting 
(x + -0.25) equal to 0.680073525 and -0.680073525.

Subproblem 1

x + -0.25 = 0.680073525 Simplifying x + -0.25 = 0.680073525 Reorder the terms: -0.25 + x = 0.680073525 Solving -0.25 + x = 0.680073525 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + x = 0.680073525 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = 0.680073525 + 0.25 x = 0.680073525 + 0.25 Combine like terms: 0.680073525 + 0.25 = 0.930073525 x = 0.930073525 Simplifying x = 0.930073525

Subproblem 2

x + -0.25 = -0.680073525 Simplifying x + -0.25 = -0.680073525 Reorder the terms: -0.25 + x = -0.680073525 Solving -0.25 + x = -0.680073525 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + x = -0.680073525 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = -0.680073525 + 0.25 x = -0.680073525 + 0.25 Combine like terms: -0.680073525 + 0.25 = -0.430073525 x = -0.430073525 Simplifying x = -0.430073525

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.930073525, -0.430073525}

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