.75x^2-.33x-1=0

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Solution for .75x^2-.33x-1=0 equation:


Simplifying
0.75x2 + -0.33x + -1 = 0

Reorder the terms:
-1 + -0.33x + 0.75x2 = 0

Solving
-1 + -0.33x + 0.75x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.75'.
-1.333333333 + -0.44x + x2 = 0

Move the constant term to the right:

Add '1.333333333' to each side of the equation.
-1.333333333 + -0.44x + 1.333333333 + x2 = 0 + 1.333333333

Reorder the terms:
-1.333333333 + 1.333333333 + -0.44x + x2 = 0 + 1.333333333

Combine like terms: -1.333333333 + 1.333333333 = 0.000000000
0.000000000 + -0.44x + x2 = 0 + 1.333333333
-0.44x + x2 = 0 + 1.333333333

Combine like terms: 0 + 1.333333333 = 1.333333333
-0.44x + x2 = 1.333333333

The x term is -0.44x.  Take half its coefficient (-0.22).
Square it (0.0484) and add it to both sides.

Add '0.0484' to each side of the equation.
-0.44x + 0.0484 + x2 = 1.333333333 + 0.0484

Reorder the terms:
0.0484 + -0.44x + x2 = 1.333333333 + 0.0484

Combine like terms: 1.333333333 + 0.0484 = 1.381733333
0.0484 + -0.44x + x2 = 1.381733333

Factor a perfect square on the left side:
(x + -0.22)(x + -0.22) = 1.381733333

Calculate the square root of the right side: 1.175471536

Break this problem into two subproblems by setting 
(x + -0.22) equal to 1.175471536 and -1.175471536.

Subproblem 1

x + -0.22 = 1.175471536 Simplifying x + -0.22 = 1.175471536 Reorder the terms: -0.22 + x = 1.175471536 Solving -0.22 + x = 1.175471536 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.22' to each side of the equation. -0.22 + 0.22 + x = 1.175471536 + 0.22 Combine like terms: -0.22 + 0.22 = 0.00 0.00 + x = 1.175471536 + 0.22 x = 1.175471536 + 0.22 Combine like terms: 1.175471536 + 0.22 = 1.395471536 x = 1.395471536 Simplifying x = 1.395471536

Subproblem 2

x + -0.22 = -1.175471536 Simplifying x + -0.22 = -1.175471536 Reorder the terms: -0.22 + x = -1.175471536 Solving -0.22 + x = -1.175471536 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.22' to each side of the equation. -0.22 + 0.22 + x = -1.175471536 + 0.22 Combine like terms: -0.22 + 0.22 = 0.00 0.00 + x = -1.175471536 + 0.22 x = -1.175471536 + 0.22 Combine like terms: -1.175471536 + 0.22 = -0.955471536 x = -0.955471536 Simplifying x = -0.955471536

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.395471536, -0.955471536}

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