0=5x^2-9x-3

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Solution for 0=5x^2-9x-3 equation:


Simplifying
0 = 5x2 + -9x + -3

Reorder the terms:
0 = -3 + -9x + 5x2

Solving
0 = -3 + -9x + 5x2

Solving for variable 'x'.

Combine like terms: 0 + 3 = 3
3 + 9x + -5x2 = -3 + -9x + 5x2 + 3 + 9x + -5x2

Reorder the terms:
3 + 9x + -5x2 = -3 + 3 + -9x + 9x + 5x2 + -5x2

Combine like terms: -3 + 3 = 0
3 + 9x + -5x2 = 0 + -9x + 9x + 5x2 + -5x2
3 + 9x + -5x2 = -9x + 9x + 5x2 + -5x2

Combine like terms: -9x + 9x = 0
3 + 9x + -5x2 = 0 + 5x2 + -5x2
3 + 9x + -5x2 = 5x2 + -5x2

Combine like terms: 5x2 + -5x2 = 0
3 + 9x + -5x2 = 0

Begin completing the square.  Divide all terms by
-5 the coefficient of the squared term: 

Divide each side by '-5'.
-0.6 + -1.8x + x2 = 0

Move the constant term to the right:

Add '0.6' to each side of the equation.
-0.6 + -1.8x + 0.6 + x2 = 0 + 0.6

Reorder the terms:
-0.6 + 0.6 + -1.8x + x2 = 0 + 0.6

Combine like terms: -0.6 + 0.6 = 0.0
0.0 + -1.8x + x2 = 0 + 0.6
-1.8x + x2 = 0 + 0.6

Combine like terms: 0 + 0.6 = 0.6
-1.8x + x2 = 0.6

The x term is -1.8x.  Take half its coefficient (-0.9).
Square it (0.81) and add it to both sides.

Add '0.81' to each side of the equation.
-1.8x + 0.81 + x2 = 0.6 + 0.81

Reorder the terms:
0.81 + -1.8x + x2 = 0.6 + 0.81

Combine like terms: 0.6 + 0.81 = 1.41
0.81 + -1.8x + x2 = 1.41

Factor a perfect square on the left side:
(x + -0.9)(x + -0.9) = 1.41

Calculate the square root of the right side: 1.187434209

Break this problem into two subproblems by setting 
(x + -0.9) equal to 1.187434209 and -1.187434209.

Subproblem 1

x + -0.9 = 1.187434209 Simplifying x + -0.9 = 1.187434209 Reorder the terms: -0.9 + x = 1.187434209 Solving -0.9 + x = 1.187434209 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.9' to each side of the equation. -0.9 + 0.9 + x = 1.187434209 + 0.9 Combine like terms: -0.9 + 0.9 = 0.0 0.0 + x = 1.187434209 + 0.9 x = 1.187434209 + 0.9 Combine like terms: 1.187434209 + 0.9 = 2.087434209 x = 2.087434209 Simplifying x = 2.087434209

Subproblem 2

x + -0.9 = -1.187434209 Simplifying x + -0.9 = -1.187434209 Reorder the terms: -0.9 + x = -1.187434209 Solving -0.9 + x = -1.187434209 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.9' to each side of the equation. -0.9 + 0.9 + x = -1.187434209 + 0.9 Combine like terms: -0.9 + 0.9 = 0.0 0.0 + x = -1.187434209 + 0.9 x = -1.187434209 + 0.9 Combine like terms: -1.187434209 + 0.9 = -0.287434209 x = -0.287434209 Simplifying x = -0.287434209

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.087434209, -0.287434209}

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