4+2x^2=9x+18

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Solution for 4+2x^2=9x+18 equation:


Simplifying
4 + 2x2 = 9x + 18

Reorder the terms:
4 + 2x2 = 18 + 9x

Solving
4 + 2x2 = 18 + 9x

Solving for variable 'x'.

Reorder the terms:
4 + -18 + -9x + 2x2 = 18 + 9x + -18 + -9x

Combine like terms: 4 + -18 = -14
-14 + -9x + 2x2 = 18 + 9x + -18 + -9x

Reorder the terms:
-14 + -9x + 2x2 = 18 + -18 + 9x + -9x

Combine like terms: 18 + -18 = 0
-14 + -9x + 2x2 = 0 + 9x + -9x
-14 + -9x + 2x2 = 9x + -9x

Combine like terms: 9x + -9x = 0
-14 + -9x + 2x2 = 0

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

Divide each side by '2'.
-7 + -4.5x + x2 = 0

Move the constant term to the right:

Add '7' to each side of the equation.
-7 + -4.5x + 7 + x2 = 0 + 7

Reorder the terms:
-7 + 7 + -4.5x + x2 = 0 + 7

Combine like terms: -7 + 7 = 0
0 + -4.5x + x2 = 0 + 7
-4.5x + x2 = 0 + 7

Combine like terms: 0 + 7 = 7
-4.5x + x2 = 7

The x term is -4.5x.  Take half its coefficient (-2.25).
Square it (5.0625) and add it to both sides.

Add '5.0625' to each side of the equation.
-4.5x + 5.0625 + x2 = 7 + 5.0625

Reorder the terms:
5.0625 + -4.5x + x2 = 7 + 5.0625

Combine like terms: 7 + 5.0625 = 12.0625
5.0625 + -4.5x + x2 = 12.0625

Factor a perfect square on the left side:
(x + -2.25)(x + -2.25) = 12.0625

Calculate the square root of the right side: 3.473110997

Break this problem into two subproblems by setting 
(x + -2.25) equal to 3.473110997 and -3.473110997.

Subproblem 1

x + -2.25 = 3.473110997 Simplifying x + -2.25 = 3.473110997 Reorder the terms: -2.25 + x = 3.473110997 Solving -2.25 + x = 3.473110997 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + x = 3.473110997 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + x = 3.473110997 + 2.25 x = 3.473110997 + 2.25 Combine like terms: 3.473110997 + 2.25 = 5.723110997 x = 5.723110997 Simplifying x = 5.723110997

Subproblem 2

x + -2.25 = -3.473110997 Simplifying x + -2.25 = -3.473110997 Reorder the terms: -2.25 + x = -3.473110997 Solving -2.25 + x = -3.473110997 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + x = -3.473110997 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + x = -3.473110997 + 2.25 x = -3.473110997 + 2.25 Combine like terms: -3.473110997 + 2.25 = -1.223110997 x = -1.223110997 Simplifying x = -1.223110997

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.723110997, -1.223110997}

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