-1.4375x^2-4.375x-0.9375=0

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Solution for -1.4375x^2-4.375x-0.9375=0 equation:


Simplifying
-1.4375x2 + -4.375x + -0.9375 = 0

Reorder the terms:
-0.9375 + -4.375x + -1.4375x2 = 0

Solving
-0.9375 + -4.375x + -1.4375x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-1.4375 the coefficient of the squared term: 

Divide each side by '-1.4375'.
0.652173913 + 3.043478261x + x2 = 0

Move the constant term to the right:

Add '-0.652173913' to each side of the equation.
0.652173913 + 3.043478261x + -0.652173913 + x2 = 0 + -0.652173913

Reorder the terms:
0.652173913 + -0.652173913 + 3.043478261x + x2 = 0 + -0.652173913

Combine like terms: 0.652173913 + -0.652173913 = 0.000000000
0.000000000 + 3.043478261x + x2 = 0 + -0.652173913
3.043478261x + x2 = 0 + -0.652173913

Combine like terms: 0 + -0.652173913 = -0.652173913
3.043478261x + x2 = -0.652173913

The x term is 3.043478261x.  Take half its coefficient (1.521739131).
Square it (2.315689983) and add it to both sides.

Add '2.315689983' to each side of the equation.
3.043478261x + 2.315689983 + x2 = -0.652173913 + 2.315689983

Reorder the terms:
2.315689983 + 3.043478261x + x2 = -0.652173913 + 2.315689983

Combine like terms: -0.652173913 + 2.315689983 = 1.66351607
2.315689983 + 3.043478261x + x2 = 1.66351607

Factor a perfect square on the left side:
(x + 1.521739131)(x + 1.521739131) = 1.66351607

Calculate the square root of the right side: 1.289773651

Break this problem into two subproblems by setting 
(x + 1.521739131) equal to 1.289773651 and -1.289773651.

Subproblem 1

x + 1.521739131 = 1.289773651 Simplifying x + 1.521739131 = 1.289773651 Reorder the terms: 1.521739131 + x = 1.289773651 Solving 1.521739131 + x = 1.289773651 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.521739131' to each side of the equation. 1.521739131 + -1.521739131 + x = 1.289773651 + -1.521739131 Combine like terms: 1.521739131 + -1.521739131 = 0.000000000 0.000000000 + x = 1.289773651 + -1.521739131 x = 1.289773651 + -1.521739131 Combine like terms: 1.289773651 + -1.521739131 = -0.23196548 x = -0.23196548 Simplifying x = -0.23196548

Subproblem 2

x + 1.521739131 = -1.289773651 Simplifying x + 1.521739131 = -1.289773651 Reorder the terms: 1.521739131 + x = -1.289773651 Solving 1.521739131 + x = -1.289773651 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.521739131' to each side of the equation. 1.521739131 + -1.521739131 + x = -1.289773651 + -1.521739131 Combine like terms: 1.521739131 + -1.521739131 = 0.000000000 0.000000000 + x = -1.289773651 + -1.521739131 x = -1.289773651 + -1.521739131 Combine like terms: -1.289773651 + -1.521739131 = -2.811512782 x = -2.811512782 Simplifying x = -2.811512782

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.23196548, -2.811512782}

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