0=3x^2-5x-7

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Solution for 0=3x^2-5x-7 equation:


Simplifying
0 = 3x2 + -5x + -7

Reorder the terms:
0 = -7 + -5x + 3x2

Solving
0 = -7 + -5x + 3x2

Solving for variable 'x'.

Combine like terms: 0 + 7 = 7
7 + 5x + -3x2 = -7 + -5x + 3x2 + 7 + 5x + -3x2

Reorder the terms:
7 + 5x + -3x2 = -7 + 7 + -5x + 5x + 3x2 + -3x2

Combine like terms: -7 + 7 = 0
7 + 5x + -3x2 = 0 + -5x + 5x + 3x2 + -3x2
7 + 5x + -3x2 = -5x + 5x + 3x2 + -3x2

Combine like terms: -5x + 5x = 0
7 + 5x + -3x2 = 0 + 3x2 + -3x2
7 + 5x + -3x2 = 3x2 + -3x2

Combine like terms: 3x2 + -3x2 = 0
7 + 5x + -3x2 = 0

Begin completing the square.  Divide all terms by
-3 the coefficient of the squared term: 

Divide each side by '-3'.
-2.333333333 + -1.666666667x + x2 = 0

Move the constant term to the right:

Add '2.333333333' to each side of the equation.
-2.333333333 + -1.666666667x + 2.333333333 + x2 = 0 + 2.333333333

Reorder the terms:
-2.333333333 + 2.333333333 + -1.666666667x + x2 = 0 + 2.333333333

Combine like terms: -2.333333333 + 2.333333333 = 0.000000000
0.000000000 + -1.666666667x + x2 = 0 + 2.333333333
-1.666666667x + x2 = 0 + 2.333333333

Combine like terms: 0 + 2.333333333 = 2.333333333
-1.666666667x + x2 = 2.333333333

The x term is -1.666666667x.  Take half its coefficient (-0.8333333335).
Square it (0.6944444447) and add it to both sides.

Add '0.6944444447' to each side of the equation.
-1.666666667x + 0.6944444447 + x2 = 2.333333333 + 0.6944444447

Reorder the terms:
0.6944444447 + -1.666666667x + x2 = 2.333333333 + 0.6944444447

Combine like terms: 2.333333333 + 0.6944444447 = 3.0277777777
0.6944444447 + -1.666666667x + x2 = 3.0277777777

Factor a perfect square on the left side:
(x + -0.8333333335)(x + -0.8333333335) = 3.0277777777

Calculate the square root of the right side: 1.740051085

Break this problem into two subproblems by setting 
(x + -0.8333333335) equal to 1.740051085 and -1.740051085.

Subproblem 1

x + -0.8333333335 = 1.740051085 Simplifying x + -0.8333333335 = 1.740051085 Reorder the terms: -0.8333333335 + x = 1.740051085 Solving -0.8333333335 + x = 1.740051085 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8333333335' to each side of the equation. -0.8333333335 + 0.8333333335 + x = 1.740051085 + 0.8333333335 Combine like terms: -0.8333333335 + 0.8333333335 = 0.0000000000 0.0000000000 + x = 1.740051085 + 0.8333333335 x = 1.740051085 + 0.8333333335 Combine like terms: 1.740051085 + 0.8333333335 = 2.5733844185 x = 2.5733844185 Simplifying x = 2.5733844185

Subproblem 2

x + -0.8333333335 = -1.740051085 Simplifying x + -0.8333333335 = -1.740051085 Reorder the terms: -0.8333333335 + x = -1.740051085 Solving -0.8333333335 + x = -1.740051085 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8333333335' to each side of the equation. -0.8333333335 + 0.8333333335 + x = -1.740051085 + 0.8333333335 Combine like terms: -0.8333333335 + 0.8333333335 = 0.0000000000 0.0000000000 + x = -1.740051085 + 0.8333333335 x = -1.740051085 + 0.8333333335 Combine like terms: -1.740051085 + 0.8333333335 = -0.9067177515 x = -0.9067177515 Simplifying x = -0.9067177515

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.5733844185, -0.9067177515}

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