(6x^2-5x-45)+(2x^2+9x)=

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Solution for (6x^2-5x-45)+(2x^2+9x)= equation:


Simplifying
(6x2 + -5x + -45) + (2x2 + 9x) = 0

Reorder the terms:
(-45 + -5x + 6x2) + (2x2 + 9x) = 0

Remove parenthesis around (-45 + -5x + 6x2)
-45 + -5x + 6x2 + (2x2 + 9x) = 0

Reorder the terms:
-45 + -5x + 6x2 + (9x + 2x2) = 0

Remove parenthesis around (9x + 2x2)
-45 + -5x + 6x2 + 9x + 2x2 = 0

Reorder the terms:
-45 + -5x + 9x + 6x2 + 2x2 = 0

Combine like terms: -5x + 9x = 4x
-45 + 4x + 6x2 + 2x2 = 0

Combine like terms: 6x2 + 2x2 = 8x2
-45 + 4x + 8x2 = 0

Solving
-45 + 4x + 8x2 = 0

Solving for variable 'x'.

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

Divide each side by '8'.
-5.625 + 0.5x + x2 = 0

Move the constant term to the right:

Add '5.625' to each side of the equation.
-5.625 + 0.5x + 5.625 + x2 = 0 + 5.625

Reorder the terms:
-5.625 + 5.625 + 0.5x + x2 = 0 + 5.625

Combine like terms: -5.625 + 5.625 = 0.000
0.000 + 0.5x + x2 = 0 + 5.625
0.5x + x2 = 0 + 5.625

Combine like terms: 0 + 5.625 = 5.625
0.5x + x2 = 5.625

The x term is 0.5x.  Take half its coefficient (0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
0.5x + 0.0625 + x2 = 5.625 + 0.0625

Reorder the terms:
0.0625 + 0.5x + x2 = 5.625 + 0.0625

Combine like terms: 5.625 + 0.0625 = 5.6875
0.0625 + 0.5x + x2 = 5.6875

Factor a perfect square on the left side:
(x + 0.25)(x + 0.25) = 5.6875

Calculate the square root of the right side: 2.384848004

Break this problem into two subproblems by setting 
(x + 0.25) equal to 2.384848004 and -2.384848004.

Subproblem 1

x + 0.25 = 2.384848004 Simplifying x + 0.25 = 2.384848004 Reorder the terms: 0.25 + x = 2.384848004 Solving 0.25 + x = 2.384848004 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + x = 2.384848004 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = 2.384848004 + -0.25 x = 2.384848004 + -0.25 Combine like terms: 2.384848004 + -0.25 = 2.134848004 x = 2.134848004 Simplifying x = 2.134848004

Subproblem 2

x + 0.25 = -2.384848004 Simplifying x + 0.25 = -2.384848004 Reorder the terms: 0.25 + x = -2.384848004 Solving 0.25 + x = -2.384848004 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + x = -2.384848004 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = -2.384848004 + -0.25 x = -2.384848004 + -0.25 Combine like terms: -2.384848004 + -0.25 = -2.634848004 x = -2.634848004 Simplifying x = -2.634848004

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.134848004, -2.634848004}

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