x^2+.75x-.394=0

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Solution for x^2+.75x-.394=0 equation:


Simplifying
x2 + 0.75x + -0.394 = 0

Reorder the terms:
-0.394 + 0.75x + x2 = 0

Solving
-0.394 + 0.75x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '0.394' to each side of the equation.
-0.394 + 0.75x + 0.394 + x2 = 0 + 0.394

Reorder the terms:
-0.394 + 0.394 + 0.75x + x2 = 0 + 0.394

Combine like terms: -0.394 + 0.394 = 0.000
0.000 + 0.75x + x2 = 0 + 0.394
0.75x + x2 = 0 + 0.394

Combine like terms: 0 + 0.394 = 0.394
0.75x + x2 = 0.394

The x term is 0.75x.  Take half its coefficient (0.375).
Square it (0.140625) and add it to both sides.

Add '0.140625' to each side of the equation.
0.75x + 0.140625 + x2 = 0.394 + 0.140625

Reorder the terms:
0.140625 + 0.75x + x2 = 0.394 + 0.140625

Combine like terms: 0.394 + 0.140625 = 0.534625
0.140625 + 0.75x + x2 = 0.534625

Factor a perfect square on the left side:
(x + 0.375)(x + 0.375) = 0.534625

Calculate the square root of the right side: 0.731180552

Break this problem into two subproblems by setting 
(x + 0.375) equal to 0.731180552 and -0.731180552.

Subproblem 1

x + 0.375 = 0.731180552 Simplifying x + 0.375 = 0.731180552 Reorder the terms: 0.375 + x = 0.731180552 Solving 0.375 + x = 0.731180552 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.375' to each side of the equation. 0.375 + -0.375 + x = 0.731180552 + -0.375 Combine like terms: 0.375 + -0.375 = 0.000 0.000 + x = 0.731180552 + -0.375 x = 0.731180552 + -0.375 Combine like terms: 0.731180552 + -0.375 = 0.356180552 x = 0.356180552 Simplifying x = 0.356180552

Subproblem 2

x + 0.375 = -0.731180552 Simplifying x + 0.375 = -0.731180552 Reorder the terms: 0.375 + x = -0.731180552 Solving 0.375 + x = -0.731180552 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.375' to each side of the equation. 0.375 + -0.375 + x = -0.731180552 + -0.375 Combine like terms: 0.375 + -0.375 = 0.000 0.000 + x = -0.731180552 + -0.375 x = -0.731180552 + -0.375 Combine like terms: -0.731180552 + -0.375 = -1.106180552 x = -1.106180552 Simplifying x = -1.106180552

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.356180552, -1.106180552}

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