2x^2+9=6x+20

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Solution for 2x^2+9=6x+20 equation:


Simplifying
2x2 + 9 = 6x + 20

Reorder the terms:
9 + 2x2 = 6x + 20

Reorder the terms:
9 + 2x2 = 20 + 6x

Solving
9 + 2x2 = 20 + 6x

Solving for variable 'x'.

Reorder the terms:
9 + -20 + -6x + 2x2 = 20 + 6x + -20 + -6x

Combine like terms: 9 + -20 = -11
-11 + -6x + 2x2 = 20 + 6x + -20 + -6x

Reorder the terms:
-11 + -6x + 2x2 = 20 + -20 + 6x + -6x

Combine like terms: 20 + -20 = 0
-11 + -6x + 2x2 = 0 + 6x + -6x
-11 + -6x + 2x2 = 6x + -6x

Combine like terms: 6x + -6x = 0
-11 + -6x + 2x2 = 0

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

Divide each side by '2'.
-5.5 + -3x + x2 = 0

Move the constant term to the right:

Add '5.5' to each side of the equation.
-5.5 + -3x + 5.5 + x2 = 0 + 5.5

Reorder the terms:
-5.5 + 5.5 + -3x + x2 = 0 + 5.5

Combine like terms: -5.5 + 5.5 = 0.0
0.0 + -3x + x2 = 0 + 5.5
-3x + x2 = 0 + 5.5

Combine like terms: 0 + 5.5 = 5.5
-3x + x2 = 5.5

The x term is -3x.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3x + 2.25 + x2 = 5.5 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 5.5 + 2.25

Combine like terms: 5.5 + 2.25 = 7.75
2.25 + -3x + x2 = 7.75

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 7.75

Calculate the square root of the right side: 2.783882181

Break this problem into two subproblems by setting 
(x + -1.5) equal to 2.783882181 and -2.783882181.

Subproblem 1

x + -1.5 = 2.783882181 Simplifying x + -1.5 = 2.783882181 Reorder the terms: -1.5 + x = 2.783882181 Solving -1.5 + x = 2.783882181 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = 2.783882181 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 2.783882181 + 1.5 x = 2.783882181 + 1.5 Combine like terms: 2.783882181 + 1.5 = 4.283882181 x = 4.283882181 Simplifying x = 4.283882181

Subproblem 2

x + -1.5 = -2.783882181 Simplifying x + -1.5 = -2.783882181 Reorder the terms: -1.5 + x = -2.783882181 Solving -1.5 + x = -2.783882181 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = -2.783882181 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -2.783882181 + 1.5 x = -2.783882181 + 1.5 Combine like terms: -2.783882181 + 1.5 = -1.283882181 x = -1.283882181 Simplifying x = -1.283882181

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.283882181, -1.283882181}

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