5x^2-3x-9-(2x^2+x-6)=

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Solution for 5x^2-3x-9-(2x^2+x-6)= equation:


Simplifying
5x2 + -3x + -9 + -1(2x2 + x + -6) = 0

Reorder the terms:
5x2 + -3x + -9 + -1(-6 + x + 2x2) = 0
5x2 + -3x + -9 + (-6 * -1 + x * -1 + 2x2 * -1) = 0
5x2 + -3x + -9 + (6 + -1x + -2x2) = 0

Reorder the terms:
-9 + 6 + -3x + -1x + 5x2 + -2x2 = 0

Combine like terms: -9 + 6 = -3
-3 + -3x + -1x + 5x2 + -2x2 = 0

Combine like terms: -3x + -1x = -4x
-3 + -4x + 5x2 + -2x2 = 0

Combine like terms: 5x2 + -2x2 = 3x2
-3 + -4x + 3x2 = 0

Solving
-3 + -4x + 3x2 = 0

Solving for variable 'x'.

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

Divide each side by '3'.
-1 + -1.333333333x + x2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -1.333333333x + 1 + x2 = 0 + 1

Reorder the terms:
-1 + 1 + -1.333333333x + x2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -1.333333333x + x2 = 0 + 1
-1.333333333x + x2 = 0 + 1

Combine like terms: 0 + 1 = 1
-1.333333333x + x2 = 1

The x term is -1.333333333x.  Take half its coefficient (-0.6666666665).
Square it (0.4444444442) and add it to both sides.

Add '0.4444444442' to each side of the equation.
-1.333333333x + 0.4444444442 + x2 = 1 + 0.4444444442

Reorder the terms:
0.4444444442 + -1.333333333x + x2 = 1 + 0.4444444442

Combine like terms: 1 + 0.4444444442 = 1.4444444442
0.4444444442 + -1.333333333x + x2 = 1.4444444442

Factor a perfect square on the left side:
(x + -0.6666666665)(x + -0.6666666665) = 1.4444444442

Calculate the square root of the right side: 1.201850425

Break this problem into two subproblems by setting 
(x + -0.6666666665) equal to 1.201850425 and -1.201850425.

Subproblem 1

x + -0.6666666665 = 1.201850425 Simplifying x + -0.6666666665 = 1.201850425 Reorder the terms: -0.6666666665 + x = 1.201850425 Solving -0.6666666665 + x = 1.201850425 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.6666666665' to each side of the equation. -0.6666666665 + 0.6666666665 + x = 1.201850425 + 0.6666666665 Combine like terms: -0.6666666665 + 0.6666666665 = 0.0000000000 0.0000000000 + x = 1.201850425 + 0.6666666665 x = 1.201850425 + 0.6666666665 Combine like terms: 1.201850425 + 0.6666666665 = 1.8685170915 x = 1.8685170915 Simplifying x = 1.8685170915

Subproblem 2

x + -0.6666666665 = -1.201850425 Simplifying x + -0.6666666665 = -1.201850425 Reorder the terms: -0.6666666665 + x = -1.201850425 Solving -0.6666666665 + x = -1.201850425 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.6666666665' to each side of the equation. -0.6666666665 + 0.6666666665 + x = -1.201850425 + 0.6666666665 Combine like terms: -0.6666666665 + 0.6666666665 = 0.0000000000 0.0000000000 + x = -1.201850425 + 0.6666666665 x = -1.201850425 + 0.6666666665 Combine like terms: -1.201850425 + 0.6666666665 = -0.5351837585 x = -0.5351837585 Simplifying x = -0.5351837585

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.8685170915, -0.5351837585}

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